my gt woundt start, it just cranks ? i can smell gass, i have checked for spark whit a timing light and it works, i have checked the sparkplugs and they are wet and fine, it startet fine before, the problem came after i used a battery charge whit start booster mode.... can this be a fryed ignition module ?
Crank the starter and watch the tachometer. If it goes up to about 300 rpm, the ignition module is working. If the tachometer needle does not move, the ICM, pickup coil, or connectors and wiring associated with them is bad.
If you can make it run on starting fluid, the spark is good and your problem is fuel delivery. (too little or too much....the spark plugs should not be wet.)
Your difficulties sound a lot like this thread....
Look for the pic in the middle of that page for info on how to backprobe. Look further down for info on backprobing the purple/white wire from the ICM. Got pulses? Suspect the ECM. No pulses, check everything on the other side of the ICM, then have the ICM checked at a parts store. -Paul
------------------ 1988 Fiero Formula 25k miles, garaged since 1988
Gall757, Where would you start investigating if the tach doesn't go to 300rpm and you have already changed the ICM?
If the tach is not moving, primary ignition is to blame. The components in the primary (low voltage) ignition are: ICM, pickup coil, part of the ignition coil, a magnet, and the connectors and wires for all that stuff. Too many ICMs are bad when new, so you should test it. With cars this old, corrosion can be anywhere, so even screws and pins should be cleaned.
Edit: You can test the ICM with the Paul.S Backprobe method, or take it to a parts store that has a tester, or throw another part at it.....because it's about $20 on e-bay....but I avoid the Big Box Store house brands...... Delcos seem to be a little more reliable.
[This message has been edited by Gall757 (edited 12-09-2014).]
i cranked her today whit a timing light. found out that there was no spark at all. later when i tryed the spark was there. and then it just went out again. it seems like my spark comes and goes like it wants..... ?
i allso found out that the conector to the cold start injector was not in place. but now the car missfires when i crank. starting to shot flames and make me losing my hearing....
Originally posted by wu-style: it seems like my spark comes and goes like it wants..... ?
If it is wet where you are, the spark plug wires may be arcing and not firing the plugs.... when it is dry, things go back to normal. New spark plug wires will fix that.
wires, sparkplugs, distributor , cap , rotor , pick up coil , icm and the coil.
All this things are new , and only 2 weeks old
With all that replaced it doesn't leave much room for ignition problems.
quote
i cranked her today whit a timing light. found out that there was no spark at all. later when i tryed the spark was there. and then it just went out again. it seems like my spark comes and goes like it wants..... ?
Are you sure the timing light is reliable and was connected well each time? I'd go old school and test again with an old spark plug, and also take a close look at spark strength while testing.
If you really do have an ignition problem, recheck everything and also look for bad connectors and corroded wires.
quote
one of the screws that holds the icm in place is broken. Are they some kind of grounding screws maybe ?
Not only for electrical connection, they hold the ICM heat sink in contact with the aluminum mounting plate in the distributor for cooling. Without heat sink compound and good contact with the plate the ICM can burn out in a hurry. If it has been like that for a while perhaps that was the start of your troubles. Fiero ICMs have a reputation as being fragile and flaky. Without good cooling perhaps the little use the new ICM has had was enough to cook it -Paul ------------------ 1988 Fiero Formula 25k miles, garaged since 1988
[This message has been edited by Paul.S (edited 12-12-2014).]
i was soldering some wires on rhe tps sensor ( 4 plugged conector ) right before this problem. can that be the problem ? im thinking bad soldering on one of the wires or ??
another thing im thinking is strange. is that on the 2 pin conector to the ecm i have power on bouth ? isnt it so that one wire should have power and one should be ground ??
i was soldering some wires on rhe tps sensor ( 4 plugged conector ) right before this problem. can that be the problem ? im thinking bad soldering on one of the wires or ??
or.....? Right wires on the right spot in the connector? Bad connection? pin in a wrong location? Why did you need to solder on the TPS? Did you heat up the TPS?
[This message has been edited by Gall757 (edited 12-13-2014).]
ok, so the car fired up today it was to wide sparkplug gap that was the problem, sice my car is heavely rebuild, and build for dragraceing i cant use the orginal sparkplug gap, because its getting alot more fuel than orginal. i had to take them down to 0,38 to make her start.
it was to wide sparkplug gap that was the problem, sice my car is heavely rebuild, and build for dragraceing i cant use the orginal sparkplug gap, because its getting alot more fuel than orginal. i had to take them down to 0,38 to make her start.
