Starts then dies
#1
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Car: 1987 z28 I-roc
Engine: Carbed 350
Transmission: 700r-4
Axle/Gears: Stock
Starts then dies
So I need a little advise on where to go with diagnosing this problem. I have an 89 2.8 5 spd, it will fire right up run fine but after about 2 seconds it dies. This just started today, yesturday it ran perfect. I did add about 100ml of fuel injector cleaner before this started to a full tank of gas. I should add if I give it any throttle at all it does right away. Here is what I have checked:
Fuel pressure tests good stays up even when car dies (sorry don't remember the exact pressure but I wanna say like 45-50)
Ignition module ( in distributor) swapped with a known good one from another car still dies
Coil swapped with known good one from another car still dies
Battery good, 12.6 volts just over 14 when running
Catalytic converter has been removed by P.O. So can't be clogged
Unplugged MAF sensor still dies
That's about all I have time to look at today, kinda unsure of where to go from here. My CEL doesn't work so I'm not sure what if any codes I have and I'm not sure how to check them. So if anyone has some advice for what to chase I would greatly appreciate it. Thanks.
Fuel pressure tests good stays up even when car dies (sorry don't remember the exact pressure but I wanna say like 45-50)
Ignition module ( in distributor) swapped with a known good one from another car still dies
Coil swapped with known good one from another car still dies
Battery good, 12.6 volts just over 14 when running
Catalytic converter has been removed by P.O. So can't be clogged
Unplugged MAF sensor still dies
That's about all I have time to look at today, kinda unsure of where to go from here. My CEL doesn't work so I'm not sure what if any codes I have and I'm not sure how to check them. So if anyone has some advice for what to chase I would greatly appreciate it. Thanks.
#2
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Car: Camaro RS
Engine: 3.1l
Transmission: auto
Axle/Gears: stock
Re: Starts then dies
I think 89s had VATS, look into that. My 92 had the same problem it was an overnight thing as well. (Vehicle Anti Theft System)
#3
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Car: 1987 z28 I-roc
Engine: Carbed 350
Transmission: 700r-4
Axle/Gears: Stock
Re: Starts then dies
I was thinking about that but I don't have a key with a chip in it and it's been running that way since I got it ( a few months ). That being said the P.O. May have bypassed it but I'm not 100% sure how I would tell.
The other thing I was thinking was possible the pick-up? Or would that just cause a straight no start?
It's a frustrating problem because for the 2 seconds it does run it runs perfectly so at that point I know all the injectors, plugs, and everything are good so I'm not sure wheee to go from here?
The other thing I was thinking was possible the pick-up? Or would that just cause a straight no start?
It's a frustrating problem because for the 2 seconds it does run it runs perfectly so at that point I know all the injectors, plugs, and everything are good so I'm not sure wheee to go from here?
#4
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Car: 91 Firebird/88 Firebird/91 Formula
Engine: V6 3.1/V8 5.0/V8 5.0
Transmission: 4L60/700R4/4L60
Axle/Gears: 3.23/2.73/2.73
Re: Starts then dies
Ohm your injectors to see if any are bad. Check your fuel pressure regulator to see if it's leaking.
#7
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Car: 86-FireBird
Engine: -MPFI
Transmission: T5
Axle/Gears: 3:42
Re: Starts then dies
bad / faulty ign switch, only gets power to run in most forward start position. got a sloppy wheel, lose tilt bolts.
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#8
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Car: 1986 Firebird
Engine: 2.8 V6
Transmission: 700R4
Re: Starts then dies
Your check engine light doesn't light? Does the computer have power?
EGR valve stuck open? (should be able to feel the diaphragm underneath the valve's edge, it's cut open there, diaphragm should be at the bottom) Diaphragm should be able to move up and down (press it with your fingers) without binding.
Big vacuum leak, how's the vac line going from the back of the intake plenum to the brake booster?
Intermittent +12 to spark coil? (The big pink/black stripe wire on the grey connector should have +12 with ignition on- which would also test Gumby's idea)
Bad fuel gauge = Out of fuel?
EGR valve stuck open? (should be able to feel the diaphragm underneath the valve's edge, it's cut open there, diaphragm should be at the bottom) Diaphragm should be able to move up and down (press it with your fingers) without binding.
Big vacuum leak, how's the vac line going from the back of the intake plenum to the brake booster?
Intermittent +12 to spark coil? (The big pink/black stripe wire on the grey connector should have +12 with ignition on- which would also test Gumby's idea)
Bad fuel gauge = Out of fuel?
#9
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Car: 1987 z28 I-roc
Engine: Carbed 350
Transmission: 700r-4
Axle/Gears: Stock
Re: Starts then dies
Well went to work a little early to see if I could figure it out and went to start it and it fired right up and stayed running. Took off the throttle body and there was probably 1/8th inch of carbon and gunk on the back side. Cleaned it up and it's been fine all day.
#10
Re: Starts then dies
I have a very similar problem with my 1983 Camaro with the 2.8 v 6, this car has not been running for over twenty years, I cleaned out the fuel tank, replaced the fuel pump and it will start up run for a few seconds then die, but I can pump the gas and it will run as long as I pump the gas.
Need help?
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#11
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Car: 1987 z28 I-roc
Engine: Carbed 350
Transmission: 700r-4
Axle/Gears: Stock
Re: Starts then dies
To Liketosail:
Your problem sounds to me like a gummed up carb. I'm no camaro expert so I'm not sure if they were car bed in that year but if they were I'd say a good cleaning and rebuild of the carb should sort ya out.
Your problem sounds to me like a gummed up carb. I'm no camaro expert so I'm not sure if they were car bed in that year but if they were I'd say a good cleaning and rebuild of the carb should sort ya out.
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