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fuel pump is pumping but no start

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  #106  
Old 01-07-2012, 05:05 PM
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Originally Posted by revans9295
Yes it was disconnected at the plug in. Only testing the TPS itself. With the neg on sig rtn and pos on tp. It will not give me a reading like that. If the TPS is bad will it keep the truck from starting ?
If your sure your test is correct and the meter is functioning correctly then yea I gotta say that TPS is dead.

Would it prevent the engine from starting? Hard to say for sure and I don't recall ever hearing where one had OTOMH.

However I'd think it could if its imparting crap into the system the computer can't deal with. Think you'd get something like a "98 hard fault" for that though, but you did get a TPS error regardless.

Did you try and start it with the TPS unplugged?
 
  #107  
Old 01-07-2012, 05:10 PM
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No I didn't but I will , did it ,didn't do anything diffrent
 
  #108  
Old 01-07-2012, 05:31 PM
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Originally Posted by revans9295
No I didn't but I will , did it ,didn't do anything diffrent
You might have had to open the throttle not sure never actually tried starting one with the TPS unplugged. It wouldn't know where the throttle plate was so no reference for adjustment for idle air.

Thought it might spit sputter little, make more attempt to start if the TPS was so screwed it was to point stop it from starting.

Regardless based on your tests I'd replace the TPS, see if the plugs are wet or dry.
If plugs are dry computer might think the throttle is full open even though its fully closed for example.
 
  #109  
Old 01-08-2012, 12:05 PM
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Update update update ! Put on a new TPS and MAP and it started. It runs good. The TPS was bad I know that for sure. Just added a MAP cause I had it. So to everyone that says a TPS won't keep it from cranking here's proof that it will. Thanks to danr1 and everybody else who had input on this problem. This thread should help a lot of people. Thanks again
 
  #110  
Old 01-08-2012, 12:35 PM
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Originally Posted by revans9295
Update update update ! Put on a new TPS and MAP and it started. It runs good. The TPS was bad I know that for sure. Just added a MAP cause I had it. So to everyone that says a TPS won't keep it from cranking here's proof that it will. Thanks to danr1 and everybody else who had input on this problem. This thread should help a lot of people. Thanks again
Hey that's great it runs!

If you have not I'd put the MAP it had back on and see if it runs.

Would show for sure the TPS itself was the problem. Myself I still lean toward a MAP preventing starting over a TPS, however yours did return rather odd test results. Might have been all it took on yours.

And gotta ask........ you had another map on hand all this time but never tried it?
 
  #111  
Old 01-08-2012, 12:49 PM
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No sir. I bought it this morning when I got the TPS. Let me try the old MAP. Ok I tried it. It tried to run but ran really bad so I put the other one back on. Maybe it was a combination of the two.
 
  #112  
Old 01-08-2012, 12:55 PM
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Originally Posted by revans9295
No sir. I bought it this morning when I got the TPS. Let me try the old MAP. Ok I tried it. It tried to run but ran really bad so I put the other one back on. Maybe it was a combination of the two.
I see way I read it sounded like you had it already.

Yup sounds like combination of the two was the problem.

While the injectors weren't the actual cause preventing it from running based on what you stated about their condition/function, doesn't sound like you'll regret having replaced them either.
 
  #113  
Old 01-08-2012, 01:00 PM
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No. What I have done to it and replaced items would eventually have to be done anyway with it sitting up that long. Oh well I'm very happy. Thanks again
 
  #114  
Old 01-14-2012, 10:58 PM
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Thanks Guys Got Mine to run with Your help

Originally Posted by danr1
On yours I suspect it be near the base of the distributor but might be near drivers side hood hinge. I'm not sure on your 90 but think its by the dizzy.

Should look like this,

Redirect Notice

I pulled out the spout connector, Put in some new plugs and she fired up. Thought something was funny when it had spark, but woulldn't run on ether ! Plugs were gas wet! Picked up a 91.5" belt and deleted the pump. I feel pretty good about the ol' girl , think I'll fix 'er up
 
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