MeanYellowZ

vehicle is 98 S10, with 4.3 auto. Starts and runs for about 2 seconds and dies. Maintains fuel pressure and the pump continues running. Ignition stays going, if you force feed it gas it will run all day. Something keeps shutting the injectors down. Items have been replaced are PCM, Fuel Pump, Relay, Fuse panel under hood,

I just bought this today for cheap because the guy who had it gave up. I am leaning towards VATS killing the injectors as soon as it starts. I am going to bypass the VATS first and try that. I had thought that the VATS killed the pump though, not killed the pulse to the injectors. Could I be wrong, it would sure be easier to bypass the VATS and make this work, that woule be COOL


ideas???????

Damon

It's not VATS. if it was you couldn't even turn the engine over.

Does the 98 have a Mass Airflow Sensor? If so, unplug it temporarily. If it's the problem you'll now get a "Check Engine Light" but the motor will stay running after startup.

meridius

ok its a 98 so it should have pass key II in it. Does it have the security light in it? if it does does it flash at all ? it sounds to me like there is a problem in the security system somewhere.

RJR99SS

i'm pretty sure s-10s dont have either vats or pass II

meridius

if it has a security light that flashes it has one or the other and in 98 it should be pass key II.

Keith27

Maybe the FPR??

The 98's Vortec have 6 small injectors with the line made on the. I know I sell alot of those for the 4.3 and 350's. Maybe its a design flaw.

Peace

MeanYellowZ

okay, help me out here GM techs, here's what I have:

The problem that makes the truck die is the injector pulsing. They will pulse once to make it start, I'm assuming this is a built in thing they have just sending out a general pulse upon cranking maybe, but they will not pulse after that. We tested the cam and crank sensors and found them good.

I have a few other problems here that could/ could not be related. I have no digital odometer readout/ shift indicator LED, no dash lighting, yet guages work, and I have no dome or under hood light power.

We ran a scanner on it and it threw me a U1064 code saying it had insufficient data from the BCM. Does the computer run through the BCM to run the engine, could that be causing my injector problem either.

Also I failed to metin earlier that this truck was in water, which is why it doesnt run now. So, keep that in mind, water was inside the truck to a point.

any ideas/ questions....please rack your brains here

MeanYellowZ

FPR has just been replaced, and it has EXCELLENT fuel pressure, new pump, filter and injectors.

again, NO injector pulse, so it has to be somethign causing that

xpndbl3

iTrader: (5)

does the security light go on during cranking and then turn off???? I have a 98 S-10 SS and it does in fact have the passlock 2 in it. I just bypassed it for my remote starter.
Steve

MeanYellowZ

the security light does not turn on, however, nor does te air bag light or the dash odometer and such, these could all not be working for the same reason.

Ricktpi

Bad BCM. The BCM controls the Passlock function.

88TPI406GTA

No one has mentioned the ignition module yet...

Did you know that the ignition modules serves two purposes? First is the spark and second, it sends a signal to the ECM to pulse the injectors...otherwise known as a reference signal.

If part of the module is bad, ie intermittant reference signal to the computer, then it would cause the problems you are looking at.

Also, if you are having some other electrical problems, perhaps you blew a fusible link or a fuse...don't overlook that...especially if your problems began at the same time.

HTH,

MeanYellowZ

Im at the BCM now, thinking that may be thr problem since the security goes through it. I believe it to be replaced, but not programmed to the vehicle. I am going to drop it off with a friend at a GM dealer to run it through the Tech II machine and check into the BCM programming

Vader

MYZ,

Wasn't there a TSB on that phenomenon?

meridius

yeah they have a bulliten on this its for the ignition switch thats causing probleems however I dont hink that that is the case here. I wiork at a GMC garage and Ive seen a bunch of them go through. if the BCM isnt programmed or was replaced they ignition needs to be relearned but the BCM must be reprogrammed first. Id say reprogram the BCM and see what all the lights and stuff do. Then if the security light flashes with the ignition on I would then try to relearn the Ignition switch. To relearn the ignition you have to put the key in try and crank it over and then let off the light will flash then. You must then let it set there with the ignition on for ten minutes or untill the light no longer flashes. then you try and crank it again and wait another ten min with the switch on, you do this three times and then try to start it it should start after the third ten minutes, if not turn the switch off and let it set a second and try starting it again. Let me know how you make out on this one.

MeanYellowZ

excellent meridius, I went to a dealer today and talked with a guy who is sharp with the computers. From what I am told, the BCM was replaced, but by a garage that I'm sure had no capabilities to program it to the truck. I am taking it there tomorrow, and the guy is going to program the computer and hook it to a Tech II? i think, and check everything out thats on the data bus. I am really hoping this fixes the problem...

I would be most happy