July 15th--Snakes......
- Thread starter mbryson
- Start date
on a GM Tbi, the injectors pulse with the ignition timing, the MAP sensor only adjust the pulse width (rich or lean) you need a tool called a noid light, pull off the connector to the injector and put the leads of the noid light onto the connectors then have someone crank the engine it'll blink if you have injector pulse, If you don't have spark either it's probabbly the ignition module, it can take both out at the same time.
well, the first thing that tells me he is getting spark is if they dump fuel down the throttle body they can get it to run, it wouldn't run without spark.78mitsu said:
Marc, I had a problem with my fuel regulator on my 4.3 TBI. You can buy a rebuild kit at any parts store for like $15 or so, IIRC. They are extremely simple to do as well, just a simple diamphram and a spring and some gaskets.
Supergper said:
You need to know if you're getting signal before you start tearing the tb apart. it could be electric, not mechanical. and a HOT GM TBI can run without spark, especially with 92 Octane. (just trust me on this one, I've chased my tail before because it will.)
It's not a hot motor, stock out of a Suburban.... and by the time we were done swearing at it, it was not hot anymore either... and it would still run then with gas pored in.
I want to remind you though... I was NOT the one running the camera :sick:
Oh I knew what you wantedShawn said:You know what pics I want to see... up and down....
I want to remind you though... I was NOT the one running the camera :sick:Meat_ said:It's not a hot motor, stock out of a Suburban.... and by the time we were done swearing at it, it was not hot anymore either... and it would still run then with gas pored in.
Oh I knew what you wanted
I mean Hot as in running for quite a while 215-240* with 9.5+ compression, but it is more likely a bad ground to the harness.
AINT SKEERED
Balls to the Walls
- Location
- Salt Lake
mbryson said:
Comes in a red and white can at all the auto parts stores. Made all the difference in the world on my XJ. You pour a 1/3 of the can through the throttle body and it smokes like a mother for while, but then itll run like a champ after.
mbryson said:
Sounds like the regulator or the injectors to me then. Was it spraying at all?
BCGPER
Starting Another Thread
- Location
- Sunny Arizona
I'll post up what I have later tonight (camera's still sittin in the Heep). Oh, I'll be sure to include the one's to embarass Bryson as well...
Shawn said:
- Location
- Bountiful, land of rocks
No spray at the injector when cranking. If you give it a little shot of gas (or a big bath) it'll start and run for a few seconds.AINT SKEERED said:
78mitsu said:
Or not. The harness is grounded on the intake where it was originally in the donor vehicle. I'm even still using the GM type battery cables. I'm SURE it's fuel related. It's either the some injector relay (?), the fuel regulator or the injectors. It ran totally fine for months and then just quit running. I'm pretty sure it's electrical based, but in the fuel system. I'll post up when I figure it out.
BCGPER
Starting Another Thread
- Location
- Sunny Arizona
Hey, I forgot about this yesterday. Pinch off the return line. If ya get it to squirt, then the regulator is toast. No squirt afterwards can only be electrical (or bad pump, which I highly doubt).
cannoncrawler
TWERNT THE MORMONS!!!!!!
- Location
- Idaho
to muck talk....not enuff pics!!!!!! lol lol
i didn't come to trip reports to get tech!
lol lol
but seriously.....i have learned a thing or two 'bout troubleshooting TBI....thanx!!
i didn't come to trip reports to get tech!
lol lol
but seriously.....i have learned a thing or two 'bout troubleshooting TBI....thanx!!
- Location
- Bountiful, land of rocks
OK....just drove it around the block. It was a CHEAP fix........
- Location
- Bountiful, land of rocks
fuse for the ECM
- Location
- Bountiful, land of rocks
Shawn said:
You did? (which fuse?)
