80's TPI Problems (need some advice)
01-10-2012, 10:12 AM
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80's TPI Problems (need some advice)
I'm new here. I'm a rock crawler, I have a cj with alot of mods (full offroad)
One mod being the TPI 350. I have had LS engines and old school engines with propane and I know my way around them ok. TPI> I'm lost
Problems are these signs and symptoms, any good advice would be great!
:Cold start is impossible without starting fluid. If I spray it, it cranks after a few tries.
:When it fires, it misses like crazy, and is so rich it will burn your eyes.
:Plugs are fouled out real bad
:With new plugs it will straighten out when the therm opens up, but not perfect.
:Mass air sensor sounds like it's gonna suck the hood in the filter.
:Still has good throttle response but pops some on deceleration.
:Once it gets hot and you shut it down, it won't crank until it cools off.
:Then I'm back to square one.
It has all the correct wiring and sensors, not sure if they are all working properly obviously. When I got the jeep in the summer it ran way better. No hard starts and no issues. Had a fuel drip at the filter and I fixed it. Other than that is was ok. Still was a little rich and burning excessive fuel.
Any Ideas on what to start with first?
One mod being the TPI 350. I have had LS engines and old school engines with propane and I know my way around them ok. TPI> I'm lost
Problems are these signs and symptoms, any good advice would be great!
:Cold start is impossible without starting fluid. If I spray it, it cranks after a few tries.
:When it fires, it misses like crazy, and is so rich it will burn your eyes.
:Plugs are fouled out real bad
:With new plugs it will straighten out when the therm opens up, but not perfect.
:Mass air sensor sounds like it's gonna suck the hood in the filter.
:Still has good throttle response but pops some on deceleration.
:Once it gets hot and you shut it down, it won't crank until it cools off.
:Then I'm back to square one.
It has all the correct wiring and sensors, not sure if they are all working properly obviously. When I got the jeep in the summer it ran way better. No hard starts and no issues. Had a fuel drip at the filter and I fixed it. Other than that is was ok. Still was a little rich and burning excessive fuel.
Any Ideas on what to start with first?
01-10-2012, 01:24 PM
#2
Re: 80's TPI Problems (need some advice)
I'm new here. I'm a rock crawler, I have a cj with alot of mods (full offroad)
One mod being the TPI 350. I have had LS engines and old school engines with propane and I know my way around them ok. TPI> I'm lost
Problems are these signs and symptoms, any good advice would be great!
:Cold start is impossible without starting fluid. If I spray it, it cranks after a few tries.
:When it fires, it misses like crazy, and is so rich it will burn your eyes.
:Plugs are fouled out real bad
:With new plugs it will straighten out when the therm opens up, but not perfect.
:Mass air sensor sounds like it's gonna suck the hood in the filter.
:Still has good throttle response but pops some on deceleration.
:Once it gets hot and you shut it down, it won't crank until it cools off.
:Then I'm back to square one.
It has all the correct wiring and sensors, not sure if they are all working properly obviously. When I got the jeep in the summer it ran way better. No hard starts and no issues. Had a fuel drip at the filter and I fixed it. Other than that is was ok. Still was a little rich and burning excessive fuel.
Any Ideas on what to start with first?
One mod being the TPI 350. I have had LS engines and old school engines with propane and I know my way around them ok. TPI> I'm lost
Problems are these signs and symptoms, any good advice would be great!
:Cold start is impossible without starting fluid. If I spray it, it cranks after a few tries.
:When it fires, it misses like crazy, and is so rich it will burn your eyes.
:Plugs are fouled out real bad
:With new plugs it will straighten out when the therm opens up, but not perfect.
:Mass air sensor sounds like it's gonna suck the hood in the filter.
:Still has good throttle response but pops some on deceleration.
:Once it gets hot and you shut it down, it won't crank until it cools off.
:Then I'm back to square one.
It has all the correct wiring and sensors, not sure if they are all working properly obviously. When I got the jeep in the summer it ran way better. No hard starts and no issues. Had a fuel drip at the filter and I fixed it. Other than that is was ok. Still was a little rich and burning excessive fuel.
Any Ideas on what to start with first?
What size injectors do you have? part #?
Check your fuel pressure at the rail while running.
Check if you have a cold-start injector on the driver-side of intake.
Check the resistance of the CTS - Coolant Temp Sensor. - the one on the front of the intake that has two wires going to it. Check both cold and warm with a digital ohm-meter.
01-11-2012, 09:43 AM
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Re: 80's TPI Problems (need some advice)
What size injectors do you have? part #?
Check your fuel pressure at the rail while running.
Check if you have a cold-start injector on the driver-side of intake.
Check the resistance of the CTS - Coolant Temp Sensor. - the one on the front of the intake that has two wires going to it. Check both cold and warm with a digital ohm-meter.
Check your fuel pressure at the rail while running.
Check if you have a cold-start injector on the driver-side of intake.
Check the resistance of the CTS - Coolant Temp Sensor. - the one on the front of the intake that has two wires going to it. Check both cold and warm with a digital ohm-meter.
What is the fuel pressure supposed to be? 45psi??
Do you know where an image of a cold start injector is, so I can better locate it??
What should the resistance be??? I'm real green at this one.
01-11-2012, 02:19 PM
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Car: 1990 T/A w/WS6
Engine: 5.7L V8 TPI
Transmission: 700r4
Axle/Gears: 3.23 w/ posi
Re: 80's TPI Problems (need some advice)
resistance last time I checked should be 15-16 ohms any lower you should replace'em to be safe.
01-11-2012, 03:55 PM
#5
Re: 80's TPI Problems (need some advice)
The cold start injector is between the front and rear pairs of runner tubes on the driver-side.
http://www.chevythunder.com/cold_start_injector.jpg
01-12-2012, 08:57 AM
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Re: 80's TPI Problems (need some advice)
:Well, went to start it last night and no fire. Sprayed start fluid, still no fire. Pulled the air filter off and sprayed it and it fired up. Ran bad but NOOO loading up. No black smoke. Put filter on it and it loaded up. Filter is completly covered with muck on the bottom and sides. Gonna clean it for sure.
: Plugs are completely ruined. Getting new ones.
: Scanned it and only thing out of the ordinary was the TPS.
It was reading WOT even without the engine running. left scanner on it and took it off the mass air flipped it to WOT and no change. Put an Ohm meter on it and it was reading same at Idle or WOT.
That should explain the engine trying to suck the hood in the intake. Which also should explain the extra fuel ??? RIGHT??
I will have an update asap if these three issues fix the problem.
: Plugs are completely ruined. Getting new ones.
: Scanned it and only thing out of the ordinary was the TPS.
It was reading WOT even without the engine running. left scanner on it and took it off the mass air flipped it to WOT and no change. Put an Ohm meter on it and it was reading same at Idle or WOT.
That should explain the engine trying to suck the hood in the intake. Which also should explain the extra fuel ??? RIGHT??
I will have an update asap if these three issues fix the problem.
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01-12-2012, 11:25 AM
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Re: 80's TPI Problems (need some advice)
I'm sorry, it did throw a code. I have gotten the parts in hand. I'll have em on tonight. When I get this figured out, I may look at some upgrade on power options.
01-12-2012, 05:45 PM
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Re: 80's TPI Problems (need some advice)
Well on we go. Cold start ruff run is fixed. Runs like a brand new setup. Drove the jeep fir a solid hour with no issues at any amount of throttle. GREAT!!!! NOW I turn it off for a hot start test and its no good. It won't hit a lick.!!!!! What now guys?????!!!
01-13-2012, 11:17 AM
#10
Re: 80's TPI Problems (need some advice)
It ran good because you put the new spark plugs in it.
The old ones were probably fuel fouled.
The old ones were probably fuel fouled.
What size injectors do you have? part #?
Check your fuel pressure at the rail while running.
Check if you have a cold-start injector on the driver-side of intake.
Check the resistance of the CTS - Coolant Temp Sensor. - the one on the front of the intake that has two wires going to it. Check both cold and warm with a digital ohm-meter.
Check your fuel pressure at the rail while running.
Check if you have a cold-start injector on the driver-side of intake.
Check the resistance of the CTS - Coolant Temp Sensor. - the one on the front of the intake that has two wires going to it. Check both cold and warm with a digital ohm-meter.
01-13-2012, 11:53 AM
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Car: 1991 Z28 Convertible
Re: 80's TPI Problems (need some advice)
First thing is to get it cranking hot at the right speed. Check all battery connection & the starter motor make sure it's not dripping in oil... Once you get it cranking you need to insure the cold start injector is not dumping fuel because the EMC thinks its cold. check the CTS resistance when hot.
01-13-2012, 12:18 PM
#14
Re: 80's TPI Problems (need some advice)
First thing is to get it cranking hot at the right speed. Check all battery connection & the starter motor make sure it's not dripping in oil... Once you get it cranking you need to insure the cold start injector is not dumping fuel because the EMC thinks its cold. check the CTS resistance when hot.
01-13-2012, 02:26 PM
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Re: 80's TPI Problems (need some advice)
Hopefully this thread will die now. LOL. Went by the shop and pulled the batt cable off and charged battery while I ate lunch. Came back plugged it all back up and boom started up NO issues. I run it to operating temp for several minutes and restarted time after time after time with no problem. Thanks guys!!!
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