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unplugged the MAP, its running a bit smoother now, still really rough at 2k rpm and above. its broken clean off the intake. going to swap out tomorrow morning, as well as the seal for the spider assembly. I guess I can't complain too much...only spent 850 for the truck....probably have that in...

i am certainly going to save that for future reference! I'm pretty darn certain its bad though...lol. It is broken off where it plugs into the intake cover.

no...i suspect the ecu doesn't work correctly anymore...or the cel bulb is burnt out. i did notice the MAP sensor was broken off...that could cause rich mixture too. but seeing as it didnt run this rough before, I doubt that is it. I'm going with the seal and new plugs for now, then MAP...

guess its off to the parts store tomorrow and buy the whole plenum set. They don't sell just the injector seal. timing cant be it...ran fine before pump / regulator went out, and I already did timing this year...thanks, I will try the seal tomorrow and see if that does it.

fuel or air? because the seal that went around the spider assembly did break...and I didn't put it back on. can it really cause backfiring that bad?

scratch my previous post...this is a second generation throttle body injection. I did have 4 of the 8 injectors wrong. Problem solved....well, kinda.. Starts fine now, but when I hit about 2500 rpm, serious backfiring...like throwing flames out the tail pipe kinda backfiring. Any ideas?? I...

Does the spider injectors have certain cylinders that they go into? I thought they fired when pressure in the cylinder dropped, so there was no need to plug into certain cylinders...maybe I have this wrong and switched an injector around?

Found out that the fuel pressure regulator was bad. And it had been for a while because the intake below the regulator was crystal clean. Replaced that last night, put the whole thing back together. This morning I checked spark on every spark plug...all firing just fine. Checked fuel pressure...

Well, I got the fuel pump working. Turns out the ground from the fuel pump has to be attached to the fuel relay and can't just be grounded to the frame. But...the darn thing still wont start. acts like it wants to on first crank, but just wont fire. Thought it was flooded, so I choked it...

97 tahoe, 229,451. And more issues than Miley Cyrus!

Thats what I am going to do...but it still doesn't make any sense. The fuel pump relay provides power to the pump until proper pressure is reached, then the oil pressure switch provides power. Running a wire directly from the fuse box should make the pump kick on regardless of a bad oil pressure...

Thats what I originally thought too. When the truck stopped running, I knew it was a fuel pump failure because there was a loud grinding noise coming from the pump, and it would cut off after 2-3 seconds. before this, the system worked fine. Horrible gas mileage and sending unit was bad causing...

Hello everyone. New to the forum. I know that everyone "new" needs help...lol, no difference here! I just replaced my fuel pump. When I went to wire up the new harness, I discovered that the wiring was kind of "rigged up". There were the standard wires coming from the factory wiring (gray...