View Full Version : need some help please

07-23-2006, 10:26 PM
unfortunatly I own a chevy 87 s10, 4cyl with a single injector tbi

the problem is that my injector is not regulating the fuel properly...I can poor gas down the throttle body and get the motor to start and run, the injector actually starts to spit fuel...it runs like a bag of shit but I can make it run...when I probe the negative side of the injector with my electrical testor it starts to run nice and smooth, kinda exactly how its suposed to run I take the tester off it dies....

I have talked to two differant mechanics and they said that it could be the ecm or the ignition modual...I have since replaced both and still same crap
any other idea's?

07-23-2006, 10:31 PM
Thats why your s-elling- it for -s-o --che-ap[f]

07-23-2006, 10:32 PM

07-23-2006, 10:35 PM

07-23-2006, 10:44 PM
leave the test lite on it!!!!!! problem solved lol

07-23-2006, 11:17 PM
trust me I thought about doing that I even went to the extent of wiring in a small light bulb, at least so I could drive it to a shop...but it doesn't quite have enough power to drive properly

07-24-2006, 07:29 AM
I would suggest following the ground wire from the injector to where it grounds and check for corrosion there, or run a new wire direct to ground or batt ground. Short of that I would think that maybe the injector itself is faulty

07-24-2006, 07:31 AM
id agree with kick, try a new ground and if that doesnt work maybe try cleaning the injector?

07-24-2006, 07:54 AM
This may sound off the wall but I had an S10 and they have a weird kind of coil that contacts underneath it....I know....I cleaned that and put some dialectic paste on it and it ran great after that. Something easy to look at anyway.

07-24-2006, 04:06 PM
Another vote for injector ground.

07-24-2006, 04:09 PM
buy a toyota

07-24-2006, 06:19 PM
fuel pump.

07-24-2006, 08:00 PM
I have changed the fuel pump probable 2 months ago...as for the ground, the injector is controlled by the negative side not the positive side...so the wire just runs straight back to the ecm, and I replaced the whole thing right back to the ecm

what are you talking about (weird kind of coil)...are you referring to the ignition modual? I am desprate to try anything...

07-24-2006, 08:00 PM
ohh and I also changed the injector as well

sj-x 500
07-24-2006, 08:08 PM
piss poor connection at the ecm or somewhere in the wire is a rub. run a new wire to the ecm.

07-24-2006, 08:24 PM
It does sound like a resistance on the ground side. But it could also be a bad injector or low feul pressure.

What wattage is the bulb in your lest light? or an LED? does it flash or steady?

The injector should have power when the key is on, should be grounded by the computer (check computer ground as well) and should be a blue wire at D16 (one of the corners) in the 32pin connector. Injector resistance is 1.16-1.36 Ohm

07-24-2006, 08:26 PM
crap I'm way behind,

then swap in a new fused power source

mabey a short to ground in the coolant sensor could cause it to go that lean too...

07-25-2006, 08:59 AM
the S-10 I had, the coil mounted on a plate with 2 I think screws...I did what I said and it ran great..I sold it or I would put up a picture.

07-25-2006, 10:08 AM
Got a manual! Check all other sensors aswell seeing that they allwork together,but sounds like posible ground.

07-26-2006, 09:42 PM
water in a relay?

07-26-2006, 09:44 PM
i had that issue with my s10, the ground wires were screwed where they connect intop the harness!... Change the ground wires and your set!...

Growly Gorilla
07-28-2006, 07:27 AM
check the wires for the injector at the throttle body where they go through the rubber grommet,famous for breaking there.[27]

07-29-2006, 09:25 AM
Hows about the fuel filter?

BeerBaron Sr.
08-08-2006, 08:23 PM
Check my recent post in Chevy Rambling

08-09-2006, 08:41 PM
exactly what growly just said. i would start there and replace the injector harness. (it's small)