92 Bravada won't start

[RadeonX]

update, well after putting in the new preassure regulator, the engine will start and you can keep it going by pumping the pedal but it runs very poorly, lots of missfires. however though, once we had it in the higher rpm range, the engine ran beautifully. this leads us to suspect that there is a vaccum leak, most likely the egr valve is stuck open. but of course while we where taking out the bolts, both of them decided to break off. now we get to go through the joys of drilling those out. why it ever be easy?

[Chris Stewart]

The EGR trouble is Trouble Code 32.
Have you tried jumpering the 2 top righthand holes at the diagnostic port with a piece of wire or a paperclip and counting the Check Engine light flashes?
You should get a single then a double flash, 1-2, or a code 12 and it should flash 3 times indicating "we're in diagnostic mode". Any other codes saved on the computer will show up as similiar flashes. At the end of Diagnostic Mode, the code 12 will be flashed 3 more times.

[RadeonX]

we had a very nice unit to check all the sensors with, can't remember the name of it some $3,000 scanning unit lol. thier are no codes being thrown, and everything appears to be working properly we were a little concerned about the map sensor though. it was reading 4v but would fluctuate a little when trying to start the car, don't know if thats normal or not and i would think that the car would still run allright without the map sensor i could be wrong though. would the egr throw a code if it was stuck open?

[Chris Stewart]

The stuck open pintle in the EGR sets the Code 34. There's supposed to be a screened EGR gasket available to Autozone to keep the little carbon chunks away from the pintle. Sometimes a coating on the pintle stem sticks mine open, I just exercise it in and out with a pencil until it frees up.
The stuck open EGR acts like a big vacuum leak, poor 'ol motor runs pretty crappy until it's fixed.

[RadeonX]

ya, the motor runs very crappy while running, but we had it running great in the higher rpm range which lead us to believe that it was a vaccum leak, the EGR valve, we aren't getting any codes thrown at least last time i checked. last time i checked was when the car would only run for a second. dk if it would pick up the code that fast. now it will run as long as i keep priming the gas just very very poorly so idk if thats it or not

[RadeonX]

well we got the EGR off today and theres nothing wrong with it. Like i said earlyer, we have been questioning the map sensor and from the sounds of what you experianced when you pulled yours, it sounds simmilar. not about the only left possibility is the whole spider kit. i'm realy hoping we don't have to replace that cause ive allready spent enough on this truck and another $350 doesn't make me happy.

[Chris Stewart]

Check the knock sensor wire, drivers side next to #5 spark plug...seems mine would die quick when the connector broke. I used a piece of vacuum hose that just did fit over the knock sensor connector end and a smaller hose that held the wire end tight while fitting snug inside the bigger line on the sensor...can getta pic if you need it.

[RadeonX]

not really sure where that is, have to remember this is a new car to me, not so much anymore though lol. i have a general idea but a picture would be greatly appreciated