92 Bravada won't start

[RadeonX]

hi, i just recently purchased a 92 bravada off a freind of mine. the car has 180,000 miles on it, bought it for a winter car. the car will no longer start. we checked the fuel preasure and noticed it was only reading 40psi at this point the engine would only crank no fire, which i know was because of the limitied fuel preasure. we replaced the fuel pump and sending unit and not the engine will start but it will not stay running. we put in a new fuel filter, car n rotor, plugs and wires. im thinking it may be the ugnition module possibally, does this sound right to you?

[cadauctions]

This is a 92 it should not have a cap n rotor that I know of. It should have Coil packs. And the Ignition Mod should be located under them. It could be getting some problems and I would replace the coil packs along with it. They only cost about $23.00 each, so it is worth replacing them, and save the old ones for emergencies. It does sound like the ignition Mod though, so run with it.

[Chris Stewart]

The '92's have a cap & rotor.
Your fuel pressure should maintain at least 52psi at idle & increase some if you blip the throttle.
Is the Check Engine light on?
What's the fuel pressure after starting?
Does the engine quit as soon as you release the ignition switch when starting?

[RadeonX]

I haven't had time to check what the fuel preassure is reading since the last time i tried starting it. i would hope it's making good preassure conssidering it's all new. the engine will start for just a second and then die, bassically kills right after i let off the ignition. when i replaced the cap n rotor i noticed that the module did look very coroded and rusted so im still hoping thats whats wrong. do you think it could be the fuel preassure regulator? if so what would be the symptoms of this? we are going to be replacing the modual today so i will keep you informed on what happens there.

[RadeonX]

just checked the fuel preassue and it read 57 while cranking and about 54 afterwards. this was on a very low battery, if that would affect it at all. installed the module and still no luck.

[RadeonX]

the ignition coil was replaced today with still no luck. it seems to be a spark problem but we aren't fully sure on that yet. is there anything else major that i should check, any fuses that have been known to cause problems with starting, the ignition switch, relays, etc... any advise would be very appreciated.

[RadeonX]

anything?

[blazes9395]

If your getting good fuel pressure, and its up to spec, test your ignition system. I see you mentioned you replaced the coil, but did you test to see if you have any spark first? You have to check for spark with a tester(safer way), or by grounding one of the wires on the engine. You could also check directly at the coil too. You run a risk of damaging the coil when you do this, but I have done it many of many times, and only once can I say it might have damaged the coil. Eaither way, test for spark first before replacing things. Don't forget you need to have a good, fully charged battery when testing anything, from fuel pressure, to ignition testing. Anything less than a fully charged battery could be making you chase phantom problems that do not actually exsist. Good Luck!

[DelCoch]

Originally Posted by RadeonX

. . . bassically kills right after i let off the ignition. . . .

It could be a bad ignition switch. Does it stay running if you don't let up on the ignition switch? I know - the stater will stay engaged, but I doubt it will hurt it for a few seconds to see if it stays running or not.

[RadeonX]

well we checked everything out today, it has very good spark, fuel preassure is right where it needs to be at, it will kill even if i keep running the starter. we checked the ohm rating on the injectors today and they read out at 5.7 correct me if im wrong but im pretty sure it's supposed to be 1.3 resistence. that seems to be our main problem. i guess we will try replacing that on friday if i get the chance to pick up the injector. i also forgot to mention that the car has the GM security system installed on it. i was wondering if that could also be preventing the injectors from firing. lol it's a very nice truck but ugh i'm allready starting to loathe it. hopefully when and if i get it running i won't have this many problems with it.

[Chris Stewart]

Check the Ignition/Gage fuse, should be a 20 amp fuse.

From fuse panel bottom left:
Go up 3 and across 1 ......IGN/GAU

[RadeonX]

checked fuses, all where good beyond the horn fuse and i believe thats for the horn and just interior lights, wouldn't think it would be interfearing with the ignition.

[Chris Stewart]

Can you hear the fuel pump running after the motor quits running?

[RadeonX]

ya, you can hear it running for a little while after starting the car. we took off the intake manifold today and it didn't look like any of the lines where leaking so i don't think i should have to buy the nut kit or replace the cpi unit. i did however buy a new fuel preassure regulator which we will be trying tommorow. now i know in my one post i said we checked the injector and had a reisitance of 5 but i was wrong lol we read a resistance of 1.4-1.5 comming from the cpi unit now it's specked at 1.3 so do you think this would be a large enough difference to cause problems?

[Chris Stewart]

OK, I just tried something on my '92. I pulled the map sensor from the intake plenum, plugged the hole in the intake then started the motor. It ran for a few seconds then quit. Hmmmm, I restarted the motor and it ran a few more seconds then quit again. You might try going to the boneyard and get a map sensor off another CPI motor and see if that fixes yours on the cheap.
Don't have a check engine light either....