1990 chevy c/k1500 350 5.7 liter 4x4, I have changed all the sensors and the computer and the fuel pump and filter, and also the tbi and distributor. The truck runs as long as you have the wire between the computer and the distributor unplugged. If you plug it in the truck floods and backfirers and dies and shoots gas out the tbi?
2006-08-21 17:17:13 · 6 answers · asked by Stacie S 2 in Cars & Transportation ➔ Maintenance & Repairs
i replaced the distributor with a new distributor
2006-08-21 17:54:50 · update #1
Ive replaced the computer
2006-08-21 17:56:05 · update #2
after replacing all these parts it does the exact same thing
2006-08-21 17:59:17 · update #3
I had a 1994 Silverado. I had the same exact problems. Replaced everything you stated and more. I was messing around the engine compartment one after being baffled so long and guess what ? I found a broken ground wire. This particular ground goes from the truck cab to the back of the engine block on the passenger side. I replaced it and wa-la problem solved. A stinking 50 cent piece of wire after having spent hundreds, just like you. PLEASE CHECK ALL AVAILABLE GROUND WIRES!!!! I can just about guarantee this.
2006-08-25 16:01:36 · answer #1 · answered by The Dave 2 · 0⤊ 0⤋
Sound like the most cost effective thing you can do is pay a professional mechanic to diagnose the problem that once properly diagnosed you may then elect to allow them to effect the repair or you may take it home and try again. The mechanic sounds like the lesser cost of all. They have all the special tools and diagnostic equipment that you nor I can afford to buy.
Even though you have "new" parts I've seen new parts turn out defective. That again is good cause to hire a pro. The money will be well worth it at this point.
2006-08-21 18:36:05 · answer #2 · answered by hithere2ya 5 · 0⤊ 0⤋
ok how many miles are on it ? how hard do you drive it ? if you have a lot of miles you may want to check the timing gears for wear, the computer can compensate for so many degrees of timing, when the wire is plugged in, it will advance the timing and with the wire unplugged it will allow the engine to run at base timing. to much play in the timing gears and chain throws off the timing
2006-08-21 18:33:53 · answer #3 · answered by taknadvantageof 2 · 0⤊ 0⤋
have you checked the EST module? It is the little electronic box mounted right next to the MAP sensor. Sounds like either the module has failed or there is a part of the wiring from the module to the PCM that has been damaged. Give it a check.
Good Luck
2006-08-21 18:37:02 · answer #4 · answered by Ironhand 6 · 0⤊ 0⤋
sounds like some sort of an over load of power, a bad sylinoid somewhere that may help control the fuel pressure. it runs with the wire unplugged,but goes crazy when plugged in. id recheck the com. or at least everything that the com. controls as far as your fuel,spark and fuel pressure. not sure,but good luck.
2006-08-21 17:36:07 · answer #5 · answered by cougarflea 2 · 0⤊ 0⤋
what did you use as a replacement distributor ???
ok after thinking about this, the computor controlls the timing on this vehicle and sounds like you have a bad computor because its trying to adjust the timing to far one direction which would explain the backfire problem
2006-08-21 17:50:50 · answer #6 · answered by Christian 7 · 0⤊ 0⤋