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Chevy S10/GMC S15-Sonoma: Problems & Solutions
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Comments
i'm going to guess computer, because i'm having the exact same problem. i just put in a brand new complete crate motor from gm and still have the problem.#2 cylinder is fuel fouling. my new motor came with injectors, sensors, throttle body, coils, plugs, wires. only thing left is computer.
good luck.
maybe someone will post that help us both.
dave
Good Luck!!
Sounds like you could have a short, probably in one of the power cables
running to the dash. You can try pulling the possitive cable off the battery and
see if the truck dies. Also, does the alternator your putting in have voltage
regulator built in, or is your regulator mounted somewhere else, if seperate
that could also be the problem. good luck!
I replied to your tps problem, just wanted to let you know about the other
code they pulled on your truck, that code also has something to do with the
tps, mine also pulled another code from the rearend, and mechanic said it was
something to do withover acceleration on the rearend, like I had did a burn-out
or something. So, what it is, is the tps being bad is telling the computer that
the truck is over reving, so inturn the computer retards it so you dont blow it up.
take care
Solenoids are electrically operated valves, so they're both right. Pretty simple to use the diagnosis flowchart for P0758. Might want to start by checking the trans wiring harness connector.
Any suggestions
Jay Baker
Any idea what a rebuild costs?
Jay
:confuse:
Joeygeno :confuse:
Joeygeno
I am not getting voltage to the FP relay when the ignition switch is turned on. If I jumper the switch contacts of the FPR, the truck starts and will run-----But if I remove the jumper, the truck immediately shuts off. Schematic shows the oil pressure switch should have kept the FP running. Cannot figure this one out. Your answer to Jameyw in March 14 was very helpful in at least understanding the system function. I do not have a decent schematic of the PCM other than Haynes,. Please help
Joeygeno
According to my haynes schematic, once the engine starts, the fuel pump oil pressure switch should takeover.. My assumption is that the fuel pump relay (Fuse box) is only active in ignition start, and the oil pressure switch takes over when the engine starts.??? Again, I am confused
http://www.autozone.com/images/cds/gif/large/0900823d8018c179.gif
I will check voltage and get back to you. Do you have a component location schematic for the PCM system on a 1998?
by the way my car was 93 sonoma v6
Joe
See my message to Alcan (#1107) I will continue using your info on the pcm wiring tomorrow.
Joeygeno
Any body have an idea?
Joe
Should have an orange wire (Hot at all times), and a pink wire (hot in run/start), but I do not have the pinouts for the ECM. Asked joe to help . I am a retired mechanical Engineer, however , my lack of orientation with this vehicle shows in this instance. Usually when I see half voltage on a circuit it indicated a blown fuse or high resistance short. Not the case in the dkgn/wh wire to the relay socket. Asked joe for the pinouts to the source voltage.
Joeygeno
PCM blue connector . Pin 20 orn circuit 440 Battery Positive Voltage
The ignition power comes from the ign sw to the underhood fuse block feeding ECM1 15 amp fuse. That’s all I can find, look for a ECM2 fuse that should be battery power.
Joe
One more mystery to this problem. It may not mean anything, however, the oil pressure switch still has me confused. Looking at the Haynes schematic of the pump circuit, and an additional schematic I obtained at the library-------- it is quite evident that this Oil switch will keep B+ to the fuel pump once the engine fires and oil pressure comes up. And I assume that as long as the oil system pressure is OK, the circuit maintains until the ignition is turned off and the engine stops.
Circuit logic states: Turn on ignition key, fuel pump energizes momentarily (2 sec), then engine fires and upon oil pressure increase, the oil pressure contact maintains fuel pump power until the engine is turned off.
Remember when I stated that I jumpered the fuel pump relay contacts, the fuel pump came on and then the engine started? But as soon as I removed the jumper (engine running), the engine immediately stopped. This should not have happened. Problem----I cannot locate where this oil pressure switch is located. Is it on the engine, or on the instrument cluster??? Before I replace the PCM, I sure would like to research this part of the circuit. After all, something had to make the PCM fail. Bummer if I replace the PCM and have the same problem due to an outside cause. Your thoughts please.
Joeygeno
Before I would buy a computer I would do this to be sure. Jumper 12 v to the dk green/ white at the fuel pump relay with the PCM connectors removed, then see what you have at pin 8 with a DVOM and a test light.
the throttle body.
On your 99 2.2L when you try to start it up can you hear the fuel pump running?
If yes you may need to check the ignition coil.
jjj4
taken a long time to shift up from 1 to 2. I just thought thats just the way it was.
But after reading some of the post here I found out it`s a problem.
So two weeks ago I took it to the shop to have it looked at.
The told we that a new set of spark plugs and a new fuel filter would take care
of that problem.
Will I handed over the $ 113.00. They did the work and the trans has worked just fine. I`m not sure what plugs and fuel filter has to do with the transmission-but
it fixed my problem. jjj4
Not surprising, I jumpered as you said, Battery voltage is there. Are you sure on my 1998 that there is no oil switch circuit to the fuel pump??
Shall I go ahead and buy the PCM???
Joe
Tim