Why does my car crank for so long before starting?
03-19-2016, 10:51 AM
#1
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Car: Firebird
Engine: 305 tbi
Transmission: 700r4
Why does my car crank for so long before starting?
My car is a 91 with a 305 and a throttle body and I'm wondering why it cranks for much longer than normal when I start, but only from cold starts. If its already warm then it starts right up. What's the problem? Or is it just an older car thing?
03-19-2016, 11:20 AM
#2
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Car: 1991 Z28 1LE
Engine: LS1
Transmission: T56
Axle/Gears: 3.42
Re: Why does my car crank for so long before starting?
sounds like it might be your temp sensor. The one on the intake, not the one in the driver's side head.
How much longer crank time are you talking? Here is a resistance chart at different temperatures. Use a multimeter and check the resistance cold.
https://www.thirdgen.org/forums/atta...ase-ctsmat.gif
How much longer crank time are you talking? Here is a resistance chart at different temperatures. Use a multimeter and check the resistance cold.
https://www.thirdgen.org/forums/atta...ase-ctsmat.gif
03-19-2016, 11:30 AM
#3
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Car: 1989 Pontiac Formula 350
Engine: L98
Transmission: 700R4
Axle/Gears: BorgWarner 3.27 Posi
Re: Why does my car crank for so long before starting?
I've been battling this issue forever on my TPI. Replaced all ignition and fuel components with no change. Will test the temp sensors...
03-19-2016, 12:04 PM
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Car: 1989 Pontiac Formula 350
Engine: L98
Transmission: 700R4
Axle/Gears: BorgWarner 3.27 Posi
Re: Why does my car crank for so long before starting?
Yep. Everything is 100% perfect. All parts are brand new end to end, and everything tests within spec. Zero vacuum leaks, etc. Even have a new MAF.
Not meaning to detract from OPs post. His is a TBI so could be totally unrelated.
Not meaning to detract from OPs post. His is a TBI so could be totally unrelated.
03-19-2016, 12:14 PM
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Car: 1988 Trans Am GTA
Engine: 350 TPI (L98)
Transmission: TH700R4
Axle/Gears: 3.27 9-bolt w/ Torsen LSD
Re: Why does my car crank for so long before starting?
Check your values with a scanner with cold engine. I also had cold start issues last spring, turned out my 5V circuit in the ECU was the problem. It gave less than 5 Volts, so for example the temp sensor reported +30 degrees C, when it was +6 degrees. Also the TPS reported 20% throttle at WOT. Replaced the ECU, and it was good again.
03-19-2016, 01:20 PM
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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: Why does my car crank for so long before starting?
Check your fuel pump relay, may be waiting for oil pressure to build up before the fuel pump kicks on.
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03-21-2016, 08:32 AM
#8
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Car: Firebird
Engine: 305 tbi
Transmission: 700r4
Re: Why does my car crank for so long before starting?
its weird has done it since i bought it. The other thing is that sometimes when it is warm it starts up and revs up to about 1200-1300 then drops down and dies, unless i quickly put it in gear before it dies.
03-21-2016, 07:13 PM
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Re: Why does my car crank for so long before starting?
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