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recommended Alternator 91 gta tpi

Old 06-08-2019, 03:19 PM
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recommended Alternator 91 gta tpi

what do most ppl go with when it comes to your alternator. My 91 5.0 idles for a minute then starts.. then refuses to start back up it just rolls and rolls.. im thinking it may be the alternator as the fuel pump seems to be working.

I would like a chrome alternator but at the end of the day it doesn't really matter.

suggestion? is it possible its not the alternator and is there a way to test them?
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Old 06-08-2019, 09:09 PM
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Re: recommended Alternator 91 gta tpi

alternator is not the problem as long as volts are above 13 while running.You need to find out if spark,fuel pressure,or injector drive is lost when the stall occurs-faulty ICM in the distributor is one of the more common causes for stall after running for a short time-next on the list would be fuel pump,then a list of about a dozen other items...
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Old 06-09-2019, 01:01 AM
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Re: recommended Alternator 91 gta tpi

Suggestion? Yeah - fuel injectors.

GD
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Old 06-10-2019, 12:49 PM
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Re: recommended Alternator 91 gta tpi

thats the thing.. i don't think the battery charges to 13... but i will have to check again... how can i tell for sure if its the injectors or the distributor.. any suggestions on a good brand name replacements?
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Old 06-10-2019, 04:11 PM
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Re: recommended Alternator 91 gta tpi

It wouldn't matter - even if the alternator was completely dead it would not give the symptoms you describe. And as long as the alt is above 12.6 at idle, and off-idle it comes up to 14.5 or so then it should be good enough to run.

If the battery has enough volts/amps to turn over the engine then it should run regardless of whether it has a working alt or not - it would run till the battery died and at that point the battery would be too low to even crank the engine. The alt has nothing to do with making the engine run - it just charges the battery and provides electrical power so the battery is not depleted while running.

GD

Last edited by GeneralDisorder; 06-10-2019 at 04:16 PM.
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Old 06-30-2019, 03:01 PM
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Re: recommended Alternator 91 gta tpi

still got the same problem... car rolls and rolls .. .then eventually starts and only stays running for a short time with driver assistance until cutting back out.

the car is flashing a code but i don't have a reader to check it.
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Old 06-30-2019, 03:02 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by 8t2 z-chev View Post
alternator is not the problem as long as volts are above 13 while running.You need to find out if spark,fuel pressure,or injector drive is lost when the stall occurs-faulty ICM in the distributor is one of the more common causes for stall after running for a short time-next on the list would be fuel pump,then a list of about a dozen other items...
Originally Posted by GeneralDisorder View Post
Suggestion? Yeah - fuel injectors.

GD
Originally Posted by GeneralDisorder View Post
It wouldn't matter - even if the alternator was completely dead it would not give the symptoms you describe. And as long as the alt is above 12.6 at idle, and off-idle it comes up to 14.5 or so then it should be good enough to run.

If the battery has enough volts/amps to turn over the engine then it should run regardless of whether it has a working alt or not - it would run till the battery died and at that point the battery would be too low to even crank the engine. The alt has nothing to do with making the engine run - it just charges the battery and provides electrical power so the battery is not depleted while running.

GD

still got the same problem... car rolls and rolls .. .then eventually starts and only stays running for a short time with driver assistance until cutting back out.

the car is flashing a code but i don't have a reader to check it.
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Old 06-30-2019, 04:11 PM
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Re: recommended Alternator 91 gta tpi

As I said - injectors. Watch this series on the late RP Multecs and how they fail. You can check the injector coil resistance with a meter. Eric on SMA is excellent with a scope and there's two parts to this series.


And you don't need a code scanner. Read through this:

https://www.freeautomechanic.com/dia...blecodes5.html

Multec failures are par for the course with this era TPI system.

Might also be a bad fuel pump. That's also par for this course.

GD
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Old 06-30-2019, 05:47 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by GeneralDisorder View Post
As I said - injectors. Watch this series on the late RP Multecs and how they fail. You can check the injector coil resistance with a meter. Eric on SMA is excellent with a scope and there's two parts to this series.

https://youtu.be/Lbdjn_uP85A

And you don't need a code scanner. Read through this:

https://www.freeautomechanic.com/dia...blecodes5.html

Multec failures are par for the course with this era TPI system.

Might also be a bad fuel pump. That's also par for this course.

GD

looks like there is fuel around one of the injectors
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Old 06-30-2019, 09:18 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by goalieforlife View Post
looks like there is fuel around one of the injectors
Well that's not ideal. Check fuel pressure at the shrader on the passenger side fuel rail, and check coil resistance on the injectors.

GD
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Old 07-01-2019, 10:39 AM
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Re: recommended Alternator 91 gta tpi

I was 45 minutes out from home and my alternator died. I drive it all the way home on battery alone.
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Old 07-02-2019, 12:15 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by GeneralDisorder View Post
Well that's not ideal. Check fuel pressure at the shrader on the passenger side fuel rail, and check coil resistance on the injectors.

GD
a local mechanic dropped by my house and told me the injector needed replacement. so I went on rock auto and got one.. I will let you guys know what happens when I install it.... do you guys have recommended brands for a 5.0 tpi I know at one point ppl used to use mustang injectors.
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Old 07-02-2019, 04:34 PM
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Re: recommended Alternator 91 gta tpi

You should probably replace them all. Get Delphi injectors from South Bay Injectors (forum sponsor).

GD
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Old 07-02-2019, 05:03 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by GeneralDisorder View Post
You should probably replace them all. Get Delphi injectors from South Bay Injectors (forum sponsor).

GD
i will take a look.. does he ship to canada.. i got the 5.0 tpi
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Old 07-02-2019, 05:40 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by goalieforlife View Post
i will take a look.. does he ship to canada.. i got the 5.0 tpi
Have to ask them. Not sure on that. You need the 19 lb Delphi injectors for a direct swap.

GD
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Old 07-03-2019, 11:35 AM
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Re: recommended Alternator 91 gta tpi

Originally Posted by GeneralDisorder View Post
Have to ask them. Not sure on that. You need the 19 lb Delphi injectors for a direct swap.

GD
should I take the time and upgrade my injectors to higher lbs? does it make a difference in hp ? because I do plan some upgrades for the GTA once the car is repaired.
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Old 07-03-2019, 11:42 AM
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Re: recommended Alternator 91 gta tpi

Originally Posted by goalieforlife View Post
should I take the time and upgrade my injectors to higher lbs? does it make a difference in hp ? because I do plan some upgrades for the GTA once the car is repaired.
That's a whole different kettle of fish. Now you're getting into tuning and burning custom chips, etc. You can't just upgrade the injectors without tuning the computer. And no - it will make zero difference in HP. The engine is an air pump. It just happens to mix the oxygen in the air with fuel for combustion as the driving force. Unless you get the engine to pump more AIR (not fuel), the performance stays the same. Larger injectors without tuning will confuse the computer and make it run worse.

GD
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Old 07-10-2019, 03:26 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by GeneralDisorder View Post
That's a whole different kettle of fish. Now you're getting into tuning and burning custom chips, etc. You can't just upgrade the injectors without tuning the computer. And no - it will make zero difference in HP. The engine is an air pump. It just happens to mix the oxygen in the air with fuel for combustion as the driving force. Unless you get the engine to pump more AIR (not fuel), the performance stays the same. Larger injectors without tuning will confuse the computer and make it run worse.

GD
can i just change one injector.. i know most ppl say to change them all but i can see the faulty one i just don't know if i can remove it without removing the runners and the fuel rails.

Last edited by goalieforlife; 07-10-2019 at 04:11 PM.
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Old 07-10-2019, 03:34 PM
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Re: recommended Alternator 91 gta tpi

You need to remove the runners. You should really replace them all especially if they are multecs.
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Old 07-10-2019, 03:36 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by Tuned Performance View Post
You need to remove the runners. You should really replace them all especially if they are multecs.
yeah i was afraid u were gonna say that. thanks.
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Old 07-10-2019, 03:39 PM
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Re: recommended Alternator 91 gta tpi

It's way too much work to do just one. You can do whatever you like but Multecs are junk at this age and replacing one would be foolish.

GD
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Old 07-10-2019, 03:51 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by GeneralDisorder View Post
It's way too much work to do just one. You can do whatever you like but Multecs are junk at this age and replacing one would be foolish.

GD
yeah i figured as much.. i know most ppl go with the bosch or delphis... which ones do u recommend? i may as well replace them all as the garage will have to do it.. im guessing at least 3 hours to change them all
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Old 07-10-2019, 03:59 PM
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Re: recommended Alternator 91 gta tpi

The Delphi’s will be a more of a direct replacement and shouldn’t require tuning.
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Old 07-10-2019, 04:06 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by Tuned Performance View Post
The Delphi’s will be a more of a direct replacement and shouldn’t require tuning.
delphi's at southbay have a steep price tag.. anyone have experience with the bosch injectors with the adapters?
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Old 07-10-2019, 04:10 PM
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Re: recommended Alternator 91 gta tpi

These Bosch 2 should be a direct replacement without tuning as well.
You can always ask them and use tg11 discount code at checkout.
https://www.southbayfuelinjectors.co...tors-1985-1992
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Old 07-10-2019, 04:11 PM
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Re: recommended Alternator 91 gta tpi

The Bosch 3s are a great injector but you need to change the battery voltage offsets in your ecms tune.
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Old 07-10-2019, 04:19 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by Tuned Performance View Post
These Bosch 2 should be a direct replacement without tuning as well.
You can always ask them and use tg11 discount code at checkout.
https://www.southbayfuelinjectors.co...tors-1985-1992
are these injectors remanufactured?

and with the bosch 3's what ecm tune would i need? so i would have to buy a new tpi chip?
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Old 07-10-2019, 04:23 PM
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Re: recommended Alternator 91 gta tpi

Yes they are remanufactured . For the tune you can but a moates.net burn2 and a sst27sf512 eeprom and a g1 adapter.
Its very easy to change your calibration. For your car you might want to use axxb.bin
http://www.gearhead-efi.com/Fuel-Inj...Information-8D
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Old 07-12-2019, 07:48 PM
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Re: recommended Alternator 91 gta tpi

I bet if you did an injector balance test you would find a couple of the other 7 are off also.
My car was running extremely rich. Removing as much fuel as the computer would allow. I think an idle BLM was like 108, or whatever the bottom is. So I measured each injector. 3 on the drivers side had a pressure drop of 20 psi (on 30 pulses if I remember) and 1 went all the way to 0. And the O2 sensor is on the drivers side so that makes sense. Over on the passenger, 3 dropped 20psi, and 1 dropped like 5. So running lean on that side. So just replace all 8 and be done with it.
I guess I was lucky because after replacement and driving around for a week, I had perfect fuel trims, no chip burn needed (although I did anyway for EGR). Maybe you wont need a burn either. But if you do, its easy to do with moates hardware and software.
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Old 07-14-2019, 12:31 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by Pro View Post
I bet if you did an injector balance test you would find a couple of the other 7 are off also.
My car was running extremely rich. Removing as much fuel as the computer would allow. I think an idle BLM was like 108, or whatever the bottom is. So I measured each injector. 3 on the drivers side had a pressure drop of 20 psi (on 30 pulses if I remember) and 1 went all the way to 0. And the O2 sensor is on the drivers side so that makes sense. Over on the passenger, 3 dropped 20psi, and 1 dropped like 5. So running lean on that side. So just replace all 8 and be done with it.
I guess I was lucky because after replacement and driving around for a week, I had perfect fuel trims, no chip burn needed (although I did anyway for EGR). Maybe you wont need a burn either. But if you do, its easy to do with moates hardware and software.
My car won't even stay goin at this point.. it rolls and rolls then starts.. I keep the gas to it but I get about 30 secondo to a min and it cuts out... I wonder if I put her in gear if she wud stay goin easier.
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Old 07-14-2019, 12:44 PM
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Re: recommended Alternator 91 gta tpi

If it’s in gear there is more of a load on the engine. Are you still messing around with the old injectors ?
what do the ohm out at ?
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Old 07-14-2019, 12:53 PM
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Re: recommended Alternator 91 gta tpi

Originally Posted by Tuned Performance View Post
If it’s in gear there is more of a load on the engine. Are you still messing around with the old injectors ?
what do the ohm out at ?
no im not actually, i was gonna try to put her in the garage which is about 100 feet away bc im goin out of town. Im ordering new injectors for her today from southbay and i do have edelbrock valve covers to go on her.. so that may be the perfect time to install them..,maybe?
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