gotabekidding

I have owned several 3rd gens in the past, mostly carb'd.

I recently purchased an 88 GTA with a 5.7 TPI.

It was advertised as having
SLP 25 pound injectors with a regulator set at 47 psi.
This engine is pretty much stock and has an overheating issue as well.

Is this a recommended set up or have I inhereted a previous owner's
attempt at some mismatched performance lack of knowledge?

There are several other "issues" I am currently trying to work out
right now, this is just one of many.

I appreciate any advice, thanks!

Tuned Performance

iTrader: (92)

You might want to start with maintenance items first, changing the coolant, thermostat and making sure the fans function and that the air damn is in place. You didn't describe is their a lack of engine power is it running rich ? It seems like something is done to warrant the larger injectors and higher fuel pressure. A lean condition can result in overheating as well. Might be more to the story that someone didn't tell you.

gotabekidding

You are correct all those items could cause it to overheat, so I will go more in depth.
I replaced the radiator and thermostat. Also changed the water pump with one for a 5.7.
Coolant was changed. All the plastic ductwork is in the bumper cover and the air dam is there as well.
As I said, I have owned several 3rd gens in the past.

I did not notice a smell of fuel nor see black smoke when running.
The heads are factory. If there is a cam, itis not noticable to the ear.
I hope this helps.

Tuned Performance

iTrader: (92)

The overly rich condition is probably the cause. If you can read the numbers off the body of the injector you might want to google search them. To me raising fuel pressure is a bandaid fix or compensation to a tune.There are several things that can make the engine run rich but since you know someone thought they were throwing go fast parts at the car I would I would look at these two areas first. I do not use afpr I compensate in the programing itself. After your done looking at the injector id drop down the ecm under the passengers side dash. pop the access cover and see what kind of memcal it has in it. If its stock it will be blue and have a silver sticker with 4 letters. post the letters and I will identify if for you. Just to make some some one didnt install a 305 memcal .

jamon8

iTrader: (3)

are your fans working?

gotabekidding

Yes, actually they were hooked up to 2 toggle switches and basically ran all the time.
That has been remedied. (one of those "other issues")
But the car would overheat while going 70 mph down the highway!!
My 89 bird and formy do not have the fans come on at those speeds.

gotabekidding

Here is the ECM:
fff9745e-4184-4768-8b31-9f7423e73414_zps3b218762.jpg?t=1392430757

1988 350 (5.7L) "F" body Camaro-Firebird-Trans Am "Y" body Corvette
Prom BCC: AKXY
Prom Code: 3287
Scan Code: 4741
Transmission: Auto
Gear Ratio: 3.27
Emmissions: Fed
Body: F


And here is the injector:
758e75e7-bb81-445f-9fbe-45820e322923_zps11be40cc.jpg?t=1392430534

12561462
Are these LS injectors?
28 pound injectors?

gotabekidding

What is "afpr"?
I posted pics of both that you asked for.
I alsp googled both.
My mind hurts now, gonna get some aspirin!!!
What else will I need to get this car running right?

Johngypsy

I am having the same issue....
I paid this guy to do some work for me, he put in 24 pond Injectors . With a 58mm throttle body, ported runners with matched pentium , Slp runners, and the base Intake, and now.... My car runs like crap, I think it will cost me like. 10 dollars just to go to the store and back ! That's how much fuel is burning, when I turn off the car, it will smell so so bad like gas and fumes, and runs I believe very rich, I am also stumped, I do have a fuel pressure regular , but unfortunately I don't know how or which way to turn it down, the guy said he maxed me out on the pressure some where in the 58 psi area? Wanted my car to do like hi 13 seconds in the 1/4 mile so bad, but it feels like I will do about 17 seconds down the track and smelling like gas fumes doing it,
By the way, I have a 5.7 liter tune port motor with a world class 5-speed transmission and 3.23 gears pose, and with a msd, and flow master exhaust (muffler)
Yea, that bad, and that much mods, and runs horrible, my wife calls my car, MR.GAS EX, slow and smells like the name........ While some may be jaw dropping laughing, I am grabbing a clean ex tissue, lol....

89rs454

I would then start looking into these possibilities. 1) the water pump is not working right. 2) Your cooling system has air pockets 3) Your L98 might have a blown head gasket.

gotabekidding

Tuned Performance

iTrader: (92)

You need to swap out the injectors and lower the fuel pressure. the memcal is correct but someone mixed matched parts. I can help tune for the correction with those injectors but after I do the first base tune I would need you to datalog. I would suggest a new o2 as well all that fuel besides washing the cylinder walls will foul the o2.

Tuned Performance

iTrader: (92)

Btw afpr = Ajustable fuel pressure regulator

gotabekidding

Thank you for your patience with me and your advice.
What brand of injector would you recommend?
What price range should I expect?
Should I replace all 9 or just the 8?

Tuned Performance

iTrader: (92)

The 9th injector is nla, I'm not really a fan of how the 85-88 uses it to aid with cold start. In 89 the programing changed and used all 8 injectors to control cold start enrichment.
http://www.southbayfuelinjectors.com...tpi-injectors/

89rs454

Running rich aka bigger fuel injectors isn't going to make a motor overheat. Running lean makes a motor melt so am i missing something?

gotabekidding

As I understand it, the injectors I have are designed to operate correctly at 65 psi.
The 88 GTA does not have that fuel pressure without a new pump install,
Add in the computer, which thinks it has a 22 pound injector,
senses a rich burning condition, will lean out the fuel.
The larger injector is already runnung on decreased fuel pressure is now getting leaned out more.

I could be wrong with my understanding.
If you change injectors, you must update the ecm with it
and make sure the engine is built for it as well.
If your heads/intake/cam isn't rated for it, you shouldn't have it!!

The previous owner(s) have mix matched this car in several ways,
not just the injectors. I have been correcting several issues.
When this car gets back to "running" it will have the correct items.
I will update this thread when that happens.
Hopefully sometime in March!

Tuned Performance

iTrader: (92)

You are correct the rich condition will be over compensated resulting is severely lean. Sorry I didn't elaborate on that .

Solders18

you need to drop the pressure WAY down. you are just drowning your motor with 24 pound injectors at 58 PSI. you are turning those 24 Lb injectors into close to 30 pound. you aren't near modified enough to need that much fuel.

Gottabekidding: you might check the spark advance. Over advanced timing can cause heat issues

Bob88GTA

iTrader: (2)

I am ROTFLMFAO!!!!!!!!!!! Sorryhttps://www.thirdgen.org/forums/images/smilies/frown.gif

Vader

Running injectors designed for 58 PSI on a system delivering 37-44 is not going to be great for fuel atomization either. Unfortunately, you may have a full set of injectors for a different engine, and probably should look at a set of replacements designed for 45 PSI - The set linked by Tuned seems to be a decent buy, but shop around to compare a bit just to make sure.

Johngypsy

Thanks for your reply, what I have done was got my friend who is a good reliable mechanic and race car guy who builds 11 section cars especially on Camaros, and he does agree what u are saying, so we went and bought a standard fuel pressure gauge, he then went and added a new set of plugs to my car, after taken them out, he showed me the fuel that was on the plugs from over kill, so it went and killed also my 02 sensor, we went and and for a new one, with tuning the pressure down to 48 psi, added a gasket at a standard 48mm as the stock throttle body, for the 58mm not the gasket that was supplied with it, to cut down the air flow, so with all these changes done and timed it to 6 degrees Atdc, the car was at it's peak, also the tps sensor was set at .45 and was taken back up to 5.8 on density, the car now drives much cleaner and nicer, still not as fast as I was hoping for, but it's a daily now, my mechanic said, once my 195cc heads are on with the lt4 hot cam, I can open the tps up more, and open up the throttle body to the 58mm and I should be fine, and with more of the fuel pressure to 60 plus psi, as he said when doing the cam & heads it will need more spark, fuel, and air, so I have these with the msd 6al, and hoping to do the 12 sec with my goal? Did a swap on the rear end last week to a 10 bolt 3.45 pose from a 1le conversion, and bought a nice set of headers with dual cats from a 2013 Camaro ss, so I am hoping to get the full power I am so craving, not a race guy by all means, but I just wanna know that it's there as we all do, I will keep u guys posted as soon as it's all installed with some clear Picts of the full out come of it all......

I started out as a 305 Tpi with a 5-spd, and just wanted a nice cruiser as a daily for under a few thousand dollars, turned out to be about 12k and going.... As the paint shop is next, going with a project is not cheap! As they say it is out there, I just feel so close to this car got to attached to it, that it's not a game for me or a project for me any longer, my hardest part is with my wife,

As she came to me last night and said it's gotta stop for a while until we are more situated with our home. She told me your choice, the car or me?

I told her maybe it's time that you visit your mom for awhile, she agreed and just left the house this morning, and now it's me the car and you guys here! OH GREAT! I just wish you guys lived here locally for some dinner later on.......

Wish me luck guys!

Bob88GTA

iTrader: (2)

Damn, John I wish you luck! Hang in there bud!

89rs454

Imo your better off buying an lt1 and being done with the stock junk. I would have picked my wife tbh, these cars are money pits. After all the races are won, you will soon or later want a piece of ***.