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Old 04-18-2010, 05:50 PM   #1
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Car: camaro
Engine: 305
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305 TPI Cold Start Issues????

I have a 1986 IROC with a 305 TPI car is hard to start when cold (sitting for about three hours) Engine starts then stumbles and dies until about the fifth try and it runs fine (Idle will fluctuate between 1700 and 500 breifly) Car runs great after this though. I thought it was the MAF, so i swapped with several other USED ones but got the same result but when unplugged the engine will run the same wont stall wont seem any different! idles around 600 (plugged in or not)...engine does have some codes such as...MAF code, coolant temp code, manifold air temp code.
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Old 04-18-2010, 06:50 PM   #2
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Car: 86 Trans Am, 88 Formula
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Re: 305 TPI Cold Start Issues????

Could be the Cold Start Injector or Cold Start Switch, or both.
Cold start injector is on the drivers side of the intake, it's the 3rd one from the front or back of the motor and looks different than the others.
Cold start switch is on the front of the intake below the throttlebody and has a connector just like the injectors.
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1988 Firebird Formula WS6
305HSR T5 195RWHP/273RWTQ
Mods: Eibach Sportlines, ASCD RA1 Hood, 01 LS1 rear with LS1 brakes, Moser Axles, Torsen Posi, 3.42 gears, TA Diff Cover,
ES Tranny & Tq Arm Mount, 160* Stat, K&N Cone Filter, TB Coolant Bypass, Holley Stealth Ram, MSD Billet Dist. Pro 5.0 Shifter,
Hooker Headers, Borla Catback, Lakewood LCA's, BMR Adj. Panhard, 2" Skulte Adaptors, 17" ZR1's w/ Nitto 555RII's,
Craig Moates Adaptors and Chips

WWW.TransAmWS6.Com http://youtube.com/watch?v=BQ54A0NY2l0
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Old 04-18-2010, 09:19 PM   #3
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Re: 305 TPI Cold Start Issues????

I thought the very same thing and replaced all the injectors but still have the same issue...could it be the ECU?
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Old 04-19-2010, 11:53 AM   #4
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Car: 86 Trans Am, 88 Formula
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Re: 305 TPI Cold Start Issues????

you replaced all 9 injectors or just the 8?
And what about the Cold Start Switch? That is what controls the 9th injector and gives extra fuel when the engine is cold.
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1988 Firebird Formula WS6
305HSR T5 195RWHP/273RWTQ
Mods: Eibach Sportlines, ASCD RA1 Hood, 01 LS1 rear with LS1 brakes, Moser Axles, Torsen Posi, 3.42 gears, TA Diff Cover,
ES Tranny & Tq Arm Mount, 160* Stat, K&N Cone Filter, TB Coolant Bypass, Holley Stealth Ram, MSD Billet Dist. Pro 5.0 Shifter,
Hooker Headers, Borla Catback, Lakewood LCA's, BMR Adj. Panhard, 2" Skulte Adaptors, 17" ZR1's w/ Nitto 555RII's,
Craig Moates Adaptors and Chips

WWW.TransAmWS6.Com http://youtube.com/watch?v=BQ54A0NY2l0
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Old 04-19-2010, 12:47 PM   #5
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Car: camaro
Engine: 305
Transmission: TH700R4
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Re: 305 TPI Cold Start Issues????

Yes that is all new....also I notice that when I unplug the MAF while the car is running it does not change the idle at all....the car runs very well when its unplugged and its warm. Also while drive the car will randomly drop RPM's...but then recover
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Old 04-19-2010, 12:47 PM
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