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| Intermittent starting issue on my 2000 Yukon (Page 1/1) |
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jimig1
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SEP 30, 03:21 PM
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Hello all,
I am the proud owner of a 2000 GMC Yukon that I bought new in 2000 and I currently have over 314,000 miles on her. She has been bulletproof up until recently when it itermittently has a starting issue. Here is what happens:
- The truck will always start first thing in the morning. It will run normally.
- We will stop somewhere, do something for an hour of 2. When we go back out to the truck to leave, when I turn the key, the engine cranks over normally, but the fuel pump does't prime. The gas gauge will also be stuck on E.
- After waiting about a half an hour, I will turn the key, the gas gauge will work and the engine will start.
I have had the truck to 2 GM dealers and a private garage. They have all had problems trying to recreate the problem. But the last garage was able to narrow it down. I know that it is not the fuel pump, because it is only 2 years old and is a Delphi pump. Plus, it always runs fine once it does start. Also. it does'nt make noise like the previous pumps did before they failed and the fuel pressure it normal.
Like I said, the last garage was able to narrow it down to either the ignition switch or the computer. I had already tried the switch, but that didn't do anything. I did buy a used computer and had it reflashed. That took care of the problem for a month, but now the problem is back.
Has anyone heard of this problem and what was the cure? Is it a wiring issue or something else. Any help would be appreciated.
Thanks,
Jim------------------
I know that it doesn't make any sense to own a 2 seater car when I have 4 children; but I DON'T CARE!!
www.cardomain.com/memberpage/531500
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PontiacJoe1995
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SEP 30, 06:40 PM
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Since you said it cranks over , have you tried spraying some starting fluid.
Maybe it's a fuel or electrical issue.
Joe.------------------
1985 Pontiac Fiero GT.
1987 Merkur XR4Ti.
1986 SAAB 900 Turbo.
1994 Ford Taurus SHO ( Sold )
Subaru Justy , Isuzu Impulse , or a Pontiac Sunbird Turbo wanted.
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carnut122
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OCT 01, 09:40 PM
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Also, pull a plug wire and lay it near a ground to check if you have spark. Do you hear the fuel pump kick on for a few seconds when you turn the key to "on" while experiencing this issue? How did you ascertain that you have good fuel pressure during the non-start condition?
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joesfiero
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OCT 01, 09:50 PM
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Your problem is very specific and very hard for anyone to diagnose especially over a forum. You are likely to get a thousand different responses here on what it "might" be. What I would do is bring it to an independent shop that has an oscilloscope or similar to read the pattern of the pump itself. Just because it is relatively new and gives good pressure doesn't mean it cant be bad. A bad or stuck brush or commutator problem could cause a no start sometimes, once that pump motor spins just a little bit it will start up and run like normal.
Otherwise, the intervals where the problems occur need to be narrowed down to make it easier to replicate. You can either play with it yourself and find out a way to make it easier to duplicate or plan on leaving your truck at a shop for several days. Many dealerships wont do this but some independent shops will. Letting a shop have the truck for a while will probably cost you less than throwing several different parts at it before getting frustrated and giving up on it. It will take someone with excellent diagnostic abilities but it can be fixed, if the truck is worth keeping its worth fixing right instead of living with the problem.
-Joe
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jimig1
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OCT 02, 01:28 PM
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carnut122, first of all, yes I am getting spark. The pump does not do the 3 second prime when the key is turned. So at that point I do not have any fuel pressure.
joesfiero. Actually, I have had the truck at both a dealer and an independent shop. They both had trouble recreating the problem. The independent shop ruled out the fuel pump, not to say that it could not be what you said. I have not benn able to find a way to easily replicate the problem because it is so random.
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carnut122
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OCT 02, 09:11 PM
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Bad ground at the tank. The sending unit and the fuel pump probably use the same ground, and they both either work or don't work at the same time. [This message has been edited by carnut122 (edited 10-02-2012).]
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Xyster
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OCT 04, 11:20 PM
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How could they rule out a fuel pump if they couldn't duplicate?
I have seen other pumps (aquarium) not start after power outages and run fine after being manually started and sometimes not have issues at all. I'm not saying it is the pump, just saying I wouldn't rule it out yet. Personally I agree with the bad ground though.
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jaskispyder
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OCT 05, 09:13 AM
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Corroded connection/worn wire somewhere?
Do you have a plug where you can apply 12v to the fuel pump?
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joesfiero
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OCT 06, 09:49 PM
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I do agree strongly with the possibility of a loose/corroded ground for the sending unit and pump. I had an older Chevy truck (93,94) that had that very issue but it was easier to duplicate than your concern. You might see if you can locate the ground and try wiggling it while the truck runs so you can see if you can get it to shut off.
-Joe
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carnut122
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OCT 12, 09:56 PM
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