HELP Will only start with starting fluid
09-18-2007, 06:27 PM
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Car: 1990 trans am
Engine: 350 tpi
Transmission: 700r4
HELP Will only start with starting fluid
O.K. guy heres whats going on. Its a 1990 TA with a TPI 350. She will only start if i give a shot of starting fluid through the throttle body. During cranking there is definetaly spark and i disconnected the fuel line and the fuel pump is pumping fuel ( i do not have a pressure gauge). Oh yeah and after starting the car runs just fine. Any ideas?
09-18-2007, 07:36 PM
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Car: 92 B4C 1LE/2010 GT/2003 P71/2002 Z2
Engine: 5.7/4.6/4.6/5/7
Transmission: A4/A5/A4/A4
Axle/Gears: 3:23/3:73/3:23/3:73
Re: HELP Will only start with starting fluid
Hmm, has the car been sitting a while? Confirm that the pressure is good at the rail, a gauge is cheap. Could be dirty injectors, just not spraying well at start-up, could also be low fuel pressure or filter. My Turbo Buick did a similar thing, and it was going lean under WOT. I tried a lot of stuff, including new injectors, and then found out that the rubber hose from teh pump to the fitting in the tank was split.
09-18-2007, 09:23 PM
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Car: 1990 trans am
Engine: 350 tpi
Transmission: 700r4
Re: HELP Will only start with starting fluid
No not sitting it is my daily driver. I changed the fuel pump with a stock delco 3 months ago and the fuel filter has under 10k miles on it. I guess i could try to get a pressure gauge but when i disconected the hose under the hood and tried to crank it gas poured out. Any other ideas.
09-18-2007, 10:21 PM
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Car: 86 IROC, 04 Ram, 05 SRT-4, 95 CBR
Engine: LB9, 5.7 Hemi, 2.4 turbo, 600cc
Transmission: 700-R4
Axle/Gears: 26 spline 3.42's for now
Re: HELP Will only start with starting fluid
a new pump may have picked up some crap your old one couldn't. check the filter again just in case. had that happen already. you definitely need to be sure you're getting adequate fuel pressure too.
09-19-2007, 12:56 AM
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Car: 92 B4C 1LE/2010 GT/2003 P71/2002 Z2
Engine: 5.7/4.6/4.6/5/7
Transmission: A4/A5/A4/A4
Axle/Gears: 3:23/3:73/3:23/3:73
Re: HELP Will only start with starting fluid
Could also be the regulator, a pressure gauge is the most valuable tool a fuel injected owner could have 
09-19-2007, 05:44 AM
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Car: 1990 trans am
Engine: 350 tpi
Transmission: 700r4
Re: HELP Will only start with starting fluid
O.K. it looks like the pressure gauge is a must have. I will pick it up thursday and see what happens. The pressure is supposed to be 42-45 correct? Thanks
09-27-2007, 03:34 PM
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Car: '86 IROC-Z/'94 Z28
Engine: 350 LT1/382 LT1
Transmission: 4L60-E/T-56
Axle/Gears: 3.45/3.42 (soon 4.10)
Re: HELP Will only start with starting fluid
Oh I know what that is. The '89+ cars didnt have cold start injectors. The '88 and earlier ones did. The car will run on either prom. Problem is, with the earlier prom the shot of cranking fuel comes from the 9th injector, and on the newer TPI motors that is programmed into the regular injectors.
so if you have an '88 or earlier prom in your '89 or later TPI, then the only cranking fuel it will get would be from the 9th injector that isnt there. You arent getting cold start fuel enrichment. Get another prom. Ask me how I know
so if you have an '88 or earlier prom in your '89 or later TPI, then the only cranking fuel it will get would be from the 9th injector that isnt there. You arent getting cold start fuel enrichment. Get another prom. Ask me how I know
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09-27-2007, 07:46 PM
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Car: 92 B4C 1LE/2010 GT/2003 P71/2002 Z2
Engine: 5.7/4.6/4.6/5/7
Transmission: A4/A5/A4/A4
Axle/Gears: 3:23/3:73/3:23/3:73
Re: HELP Will only start with starting fluid
Good tips, had not thought of that one!
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