- #475 of 511
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Re: GMC Jimmy ECM Fuse [darren04]
by gmck9
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May 17, 2008 (4:25 am)
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Replying to: darren04 (May 16, 2008 9:59 pm)
Well, first when diagnosing a problem.....what does the ECM fuse directly supply power to? A fuse is a load limiting device like a breaker in your house electrical pannel. Fuses are only to limit loads.....so the device(devices) on that fuse are malfunctioning, causing a higher load on that circuit. I looked up what fuse #10 does....if it is correct, #10 does pcm module, and ignition module, also, all the fuel injectors. Knowing these vehicles, and yours is a '95 model......I'd first start with having a fuel pressure gauge put on the fuel line check valve located behind the plenum(i thnik its spelled like that). If you havent changed the spyder assembly yet from the lines dry-rotting from heat under the plenum, then this may be causing the fuel pump to overwork trying to keep fuel pressure up in the 52 psi range. When you hook the fuel pressure gauge up to the check valve, start the engine to get pressure(over 50psi)....then shut engine off leaving the gauge on the vehicle.....it should stay the same....NO DROP AT ALL!!!!!!! If it moves....there ya go. New spyder assembly for you and its really expensive so I hope for you its not. And if that check comes back O.K.....then change the fuel filter to make sure its not clogged(good to change anyway with all this junk gas).....if those two things dont help....let us know. 
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- #476 of 511
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Re: GMC Jimmy ECM Fuse [gmck9]
by darren04
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May 17, 2008 (10:02 am)
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Replying to: gmck9 (May 17, 2008 4:25 am)
Hey thanks for the speedy reply, so heres the scoop. Fuel pump, filter and the CPI unit (the spyder thing) have been replaced. The truck was just in the shop and they said the fuel pressure was good. They sugested a loose wire or short somewhere but yet couldnt find anything. I drove the truck today and so far no blown fuse, but then again it did that yestureday, drove fine then bam fuse gone. Could it be something that simple as a lose wire or bad connection? And if so where would I start to find this and why is it only fuse 10?
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- #477 of 511
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Re: GMC Jimmy ECM Fuse [darren04]
by jlflemmons
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May 17, 2008 (12:03 pm)
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Replying to: darren04 (May 17, 2008 10:02 am)
could be an intermittent problem in the ECM itself. The electrical system in the vehicle supplies power through the ECM fuse, but there are further electrical filtering circuits in the ECM itself that could be failing. Very tough to diagnose intermittent problems like these. Try to be observant to any other behavior of the vehicle when the failure occurs. A big part of troubleshooting is observation and logic.
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- #478 of 511
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Re: GMC Jimmy ECM Fuse [darren04]
by gmck9
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May 17, 2008 (6:53 pm)
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Replying to: darren04 (May 17, 2008 10:02 am)
The other guy couldn't have said it any better.....since you said you drove it all day and no fuse blown yet, try to make it blow......do everything possible, but like the other guy said PAY ATTENTION to what your doing so you know what blows the fuse. It is tough since fuse#10 supplies power to more than one specific location.
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- #479 of 511
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Re: HELP!!!! clunk in front end HELP!!!!!!! [jlflemmons]
by gmck9
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May 18, 2008 (5:31 am)
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Replying to: jlflemmons (May 15, 2008 8:22 am)
Good news  noise is GONE!!!!!!!  I picked my jimmy yesterday, and the work done at this Napa center was A-1!!!!!! He flipped the bolts around that the other mechanic put in backwards on my lower ball joints, fixed the alignment(steering wheel was cocked to 10 o'clock, and pulled to the right), and I now have the Napa upper control arm bushings in there. O.k. heres the weird thing.....when driving the car from the screwy mechanic to the good one....still the noise was there even though the new control arm bushings were in, so I'm wondering if it was from the lower ball joint bolts not being in the right way(maybe they wouldn't tighten all the way), or maybe it was from the cheap autozone crap parts?????Don't know......but all I care about is that annoying clunk is GONE!!!!!!
On a different subject....through all the searching of problems....I saw that a MAJOR issue with these newer Jimmys that use dexcool is that the heater cores clog(I see that post ALOT) I'm wondering if its from everyone says DONT let dexcool get low or it will sludge up.....well, what happens to your heater core when temp switch is set to A/C or the cool setting.....it closes the valve to allow coolant to flow through the core, so in my eyes....thats the same as letting it get low, and I'm thinking thats why it sludges up in the core......from driving in summer months with the temp set to cold(coolant just trickles through the core clogging it up!!!!! IS THIS CORRECT??????????should I switch to green coolant to avoid this problem? or will it mess the gaskets up??? 
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- #480 of 511
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Re: HELP!!!! clunk in front end HELP!!!!!!! [gmck9]
by jlflemmons
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May 18, 2008 (4:57 pm)
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Replying to: gmck9 (May 18, 2008 5:31 am)
Guess what? Blazers don't have heater control valves. Coolant is always going through the core. I know, I was surprised to find out that they don't use a valve, too.
The biggest problem with dexcool it that GM was being more than optimistic with the life span. If changed every 5 yrs, 60K miles, it doesn't seem to sludge up. But if you let it get low and get a lot of air in the system, problems.
And never, ever let someone "top it off" with the green stuff. If this happens, the whole cooling system must be extensively flushed. The two chemistries just do not play together at all.
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- #481 of 511
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Re: HELP!!!! clunk in front end HELP!!!!!!! [jlflemmons]
by gmck9
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May 19, 2008 (4:18 am)
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Replying to: jlflemmons (May 18, 2008 4:57 pm)
Ya, I read that the chemicals that control corrosion when mixed(dexcool and the green coolant) will break each other down, so then there will be no corrosion defense. Also I read that there is an uncertainty about the gaskets breaking down when mixed or when switching from types of coolant. So I guess I'll just change my coolant like NOW ...I'm sure the previous owners haven't done ANYTHING to this vehicle except put gas in it and drive it. 
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- #482 of 511
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Re: GMC Jimmy ECM Fuse [gmck9]
by darren04
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May 19, 2008 (6:11 am)
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Replying to: gmck9 (May 17, 2008 6:53 pm)
So finally after way to long going through wires I have found the short. It was the plug going into the coil pack under the hood. The problem is still there because I'm not sure if its the plug itself or the actual coil pack. But thanks for all the help and ideas where too look. Now I just need that new plug and or coil pack, probably a good idea to replace both is what I'm thinking.
Thanks,
Darren
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- #483 of 511
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Re: ABS/BRAKE LIGHT 2001Jimmy [ktsmith]
by kcd2006
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Jul 22, 2008 (3:27 pm)
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Replying to: ktsmith (Oct 25, 2005 12:39 pm)
First run diagnostic of ABS sensor for each tire. It may save you money! If one sensor is off replace it. Our repair shop did this to find the Front Pass. side sensor reading 0 at 5m/h. Our hub was fine, the sensor was bad. Called parts store was told that sensor was only available with aftermarket hub for $300. Called GM dealer sensor only $83.
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- #484 of 511
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one thing leads to another . . .
by isoia
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Aug 12, 2008 (10:35 pm)
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Always seem to have problems after going through the carwash. Just replaced the fuel pump, broke down on the freeway, ignition wasn't making an electrical connection so my key was stuck, and I had absolutely no power. The problem was I needed to clean the two-way fuse underneath the battery. It ran beautifully since then. NOW . . . I have a problem with the fuel filter! Again, the problem arises after a trip to the carwash. I've replaced the fuel filter, but the hose connecting to the top of the filter is partly busted, and doesn't snap into place with the new filter. It is the RIGHT part with the right accessories. The previous owner used two O-Rings for the filter, but I've decided to use just one, and it's left me with a major fuel leak. Has anyone encountered this problem? Any suggestions, before having to replace the entire fuel line?
Thanks, iSOiA
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