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SUVs Chevrolet Blazer Chevy Blazer GMC Jimmy Electrical Problems
472 messages, Last post on Nov 19, 2009 at 4:18 PM
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Replying to: madijud (Sep 17, 2007 10:37 am) 
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i have a gmc jimmy and it doesnt start without me jumping it. i put a new alternater, a new batter, and a new starter. It still won't start without me jumping it. Can anyone help me?
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My 2001 Jimmy won't start if it sits in cold weather (around 32 F) longer than a couple days, something that just started this winter (previous, colder winters were not a problem). The starter will crank and crank, the engine just won't start. Once I warm it up (tow it to a garage, for instance), it fires right up. If I drive it every day--no problem. Coil and coolant temp sensor were replaced--no dice. Put a distributor and ignition module from a Blazer on there--no dice. Plugs, wires, rotor and battery are all about 1.5 years old. No codes coming up on diagnostic. Plugs are all wet--getting plenty of fuel, mechanic thinks they're just not getting enough voltage, that maybe changing them again would do it. I find it hard to believe that all six plugs would have the same problem. Am overseas where parts are tough to come buy, so just popping in a new set of plugs isn't as easy as it sounds. This thing is kicking my butt--any thoughts? Thanks!
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Replying to: judastouch (Mar 24, 2008 8:08 am)
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Replying to: judastouch (Mar 25, 2008 3:52 am) Just re-read your post. Does it start immediately if you jumper it? There is also a crankshaft position sensor on the front of the engine, bottom side by the crankshaft pully. While this *should* set a code if bad, it doesn't always. Voice of experience on that one! I would try the same trick of blowing the hair drier on the sensor (it is an external sensor that shuts off spark if it thinks the engine is not turning) and see what you get. I am all about trouble shooting instead of parts swapping. Assuming all the ignition parts were reconnected correctly, the likelyhood of six bad sparkplugs is right up there with winning the lottery. Without buying a ticket.
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Replying to: jlflemmons (Mar 25, 2008 4:36 am) It's something I've considered doing for lots of parts under the hood, nice to have it narrowed down. Haven't tried jumping it yet. It crossed my mind, but since it cranks so hard, I ruled it out. I guess it's worth a shot. Talked to a GMC dealer, who immediately suggested the fuel pressure regulator or fuel pump. Like I said, it's getting plenty of fuel in the cylinder, but if the pressure regulator is flooding it, then that'd give me the same problem, so I think I'll heat up the FPR, too. He also suggested a vacuum leak, which the mechanic had already ruled out. I agree on the plug thing--he's convinced I have a voltage problem, and wants to try that, or at least pulling and cleaning them. I just don't see it. Thanks again; I'll be sure and post the solution (assuming I find it). And I'll gladly take more suggestions.
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Replying to: judastouch (Mar 25, 2008 7:48 am) Not saying water is the problem here, but just to keep an open mind about what looks right but may not be. Seems half of troubleshooting these newer electronic systems is observation and logic. |
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Replying to: firstshirt1sg (Jan 13, 2007 5:01 am)
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Replying to: pgarrett2 (Apr 09, 2008 11:15 am) I *think* it was indeed the fuel pressure regulator (FPR), though I can't say with 100% certainty. I didn't have an extension cord long enough to reach the parking lot, so I filled a large Zip-loc bag with hot water and set it over top of the FPR and left it for about 20-30 minutes. It fired right up. The reason I'm not certain the problem was the FPR is because we've warmed up a bit here--it was probably almost 45 F when I did this (it was not starting at about 40 and under). So, it might have been the FPR, or it might have been some other part that was warm enough at 45. I thought about trying to start it without first warming up the FPR, but I knew that if it didn't start I was going to flood it, and I was afraid it wouldn't start even after I'd warmed it up. I went ahead and ordered a new FPR, but I think spring has sprung, and I won't know for sure if that was the problem until next winter. |
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Replying to: ktcim1 (Mar 18, 2008 2:29 pm) Mechanic said there was no ignition system problems, but the fuel pressure was 45-50 lbs. From reading other posts, this could be an issue. Any suggestions?
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