Well it happened again, my TPI engine won't start. It seems the injectors are not firing, they don't light a noid light while cranking. I have good fuel pressure-48 psi indicated on the fuel rail.

I sprayed starting fluid down the throttle body and it fired right up and then runs fine. I'll drive it a few days and the no start condition returns.

Why would it start and run fine with start fluid and not start by itself??

John

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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Trick Flow Heads, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Dynomax Cat-back, Serpentine belt setup.

http://64.176.105.239/octride.htm

 

john,
is your key real loose in the ignition?
you might want to bypass the VATS in your car temprorarily and see if that cures the problems. the VATS kills the injector pulse during cranking. second check the ignition pickup coil. tendecy to wreek havoc during cranking. the two main parts to look at for your symptoms..
let us know??
airdeano

 

Well I have put up with the problem all winter long having to use starting fluid once in a while, maybe once or twice a month. Lately within the past month it became a daily thing, you know go to work, work all day get off and walk to the car, the thing doesn't start!!! I spray and go home, next dat same thing, I spray and go home.Well after about a week of this I decide to go ahead and change the ignition module because that's where the computer gets the cranking signal so it can fire the injectors below 400rpm. After 400rpm the computer goes into "run" mode and doesn't use the module signal anymore thats why I could use starting fluid to get past the 400rpm mark.

All in all the new module is doing great, I haven't had to spray in a month now and I consider the problem fixed. Just thought I should share....also notice the start date of this thread.

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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Dynomax Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
My Camaro Project

[This message has been edited by John Millican (edited February 26, 2001).]

 

John, you scared me. All I saw was this thread, and didn't see when it was started, and I thought it was acting up again. DON'T DO THAT!!! But then I figured that if it did act up again, you would be calling me at work saying WTF!?!?

Anyway, you are part right about the Ignition Control Module. There are two ICM modes like you mentioned, but the ECM ALWAYS gets the pulses from the ICM, not just in cranking.



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'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

I didn't mean to scare you GMTech, I was just giving a little feedback so others can solve their problem if they have the same one. I know this is a very common problem among F-bodies. There have been several posts at this board alone with the same symtoms as mine.

Thanks for the correction about the modes of the module, I did not know that.

 

check your distributor and make sure its tight. and also check the timing. check for bad ground wire on the battery.

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1989 firebird formula


Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 160 (882) heads,.447/.447 lift 222@.050 duration speed pro 327/350hp cam 350 .40 over (356) edlebrock performer rpm intake and a 600 edlebrock manual choke (1405) Proform H.O. distributor slightly revised 700r-4


Future mods comp extreme energy roller cam, world products sportsman 2 heads, msd 6al ignition, billet distributor, blaster 2 coil and a 406 engine is in the works soon!!!!