The TPS failed every one except the wide open test. All the other test were low or didn't read at all. The MAF came off the runner and stored in the back of it the whole time. Then was put back on, no cleaning or messed with, just on and off. It failed all the test except for closed and open on terminals 1 & 2 if I recall. Sorry I'm not much help, I just don't remember all the details.

If I replace my TPS and jump the two brass terminals on the MAF connection and the truck starts, GREAT!! If then I plug the MAF back in and the truck won't start I know I will have to replace the MAF too. Either way I currently have the Brass terminals jumped and still no luck, so something else is causing it not to start.

Everyone keeps telling me it sounds like a timming issue, then you tell me that the TPS conntrols some of the timming. So it would make logical since for me to replace the TPS first, plus it is less costly!

Any recomendation on where to get a TPS? I need to know so I can go get one.

GOI

30 replis and nobody has asked if you have torn the injector harness apart yet to look for THE MOST COMMON cause of injectors not firing?

There is a crappy butt connector that connects the ground wire for all 4 injectors about 12" up from where the #1 injector wire peels out of the harness. On 3 of 4 harnesses of mine it was broken...resulting in no fuel to the cylinders other than the cold start injector....which won't sustain the engine for running. Runs as long as you are shooting starting fluid??? Yup, injectors arent triggering!

Do a search for injector wiring and you will find alot of information and even some pictures on the problem and fix.

Betchya a nickel (I'll get one from the wife <img src="/forums/images/graemlins/wink.gif" alt="" />) thats where the problem is. Should take less that 2 hours to pull harness apart, solder the link and have it back together.

~Darin <img src="/forums/images/graemlins/baby.gif" alt="" />

Well after doing several searches on this form and on Google I have found nothing about this. Only wiring diagrams. Does anybody have a link to the form which discribles this procedure, because I think we are on to something here. Besides I would rather try this than spending tones of money for sensors that may or maynot work.

I did however take the wiring harness apart and haven't found any loose joints, but then again I don't know what I'm looking for. <img src="/forums/images/graemlins/confused.gif" alt="" />

Please help,
GOI

Easy to search for, hit the "SEARCH" button above and search for "+injector +splice" and this thread will come up:

http://www.4x4wire.com/forums/showf...&o=&fpart=1&vc=1

Just to keep things straight, that wasn't me. I haven't seen anything describing how the TPS affects timeing, but I assume since the ECU controls timeing that a TPS failure is causing the computer to set the timeing incorrectly.Maybe those who know more about that can eleborate.


Well, even if that works to get the truck running, you already *know* the TPS & AFM are bad so they'll need to be replaced before it runs 100% right anyway, so it's not like you're throwing money away....

Dave

I mentioned the TPS/timing issues above, or you can read about it on the page below:
http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml#Troubleshooting

In short, for the 5BTDC timing to be correct, the timing jumper must be installed *AND* the TPS IDL-E2 contact must be closed. Unless both conditions are present, the ECU will not go into the special timing set mode and in that case a base timing of approx. 12BTDC is closer to stock. And that means that if you try to set 5BTDC without the jumper/TPS working, you will have the timing retarded about 7 degrees from stock.

Wow, this is a great thread. I hope the soldering job does the trick. Like I mentioned before, my truck had/has the exact same symptoms. I, however, already replaced the TPS and MAF <img src="/forums/images/graemlins/shiner.gif" alt="" />. It still wouldnt start after all that. It would really be great to have a relaible truck after all this time and money.

THANKS for the links! I'll cheak those wire connections when I get home.

Do the injector wires connect again further up the harness or to they remain separate? I haven't had a lot of time this weekend to cheak things out so hopefully I will get these wires tracked down tonight.
On the injector ground that attaches to the intake; does it have a splice in it or does it run from there to the computer?
Are there any more spices that could be the culprit in my trouble shooting?

Thanks again,
GOI

WELL,
Last night I took apart the wiring harness and found that everything was in great shape. Not one wire strand was broken, just to make sure that everything was good I took a look at all the butt connectors that I could see.

After some testing (with a light bulb and some wire) I found out that I am getting power to the injectors but they are not grounding. SOOOO, no grounding, no circut, no pulse, no fuel, no go. I have found a big problem here. The ground wire that goes to the intake test out good, well as far back as the first butt connector.

Any Ideas of where to go from here? DO you think my ECU is bad? I will probably pull it tonight to get it tested. As far as I can tell the grounds go straight to the computer. And if the computer grounds the injectors, and I'm not getting a ground when cranking the motor, Computer must be bad, right?

Thanks for all the Ideas so Far, keep 'um comming! <img src="/forums/images/graemlins/kewl.gif" alt="" />
GOI

Dont know if you've tried this yet but have you checked into the ignitor? Maybe you have a buddy who has one you can borrow for a few minutes. It helped mine.