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Chevy Blazer GMC Jimmy Electrical Problems

607 messages,  Last post on Mar 25, 2013 at 5:45 PM

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What is this discussion about? Chevrolet, GMC Jimmy, SUV

Messages Page 53 of 61

#521 of 607 Re: Timing a 99 gmc jimmy with aftermarket performance distributor [cwangs1] by cardoc50

Mar 29, 2010 (10:34 am)

Replying to: cwangs1 (Mar 28, 2010 7:39 pm)
I can only assume you have the 4.3HO obdII engine.If so,I had been looking for high
energy ignition parts in Summit racing and Jeggs also. I could not find what I was
looking for because the factory distributor only has a camshaft position sensor in it. As for timing, there are two crankshaft position sensors one on each side of the harmonic balancer.Of course these 3 sensors tell the ECM when to change ignition
timing. As for the throttle body, it does not have gas flow, just air flow. The injectors
are at each cylinder under the top half of the intake manifold.You must have changed the coil and ignition module also in order to get it to run. As you said you
cain't set the timing because the crankshaft pos. sensor and the camshaft position sensor does this through the ECM. The type of distributor you used does not have
camshaft position sensor.Of course if you did get it to run right with the new parts you will definately need a new high performance Mass air flow sensor at about $300.00 dollars. I can't see it working right at all. All of the above is taking for granted you have the OBDII HO engine.I'm thinking that's all they used since 1997.
Good luck and with my factory 4.3 I can outrun a lot of V8's.Hope this helps.

#522 of 607 Re: 2000 Chevy Blazer Electric Locks [cararyarber] by jeff1280

Apr 06, 2010 (4:36 pm)

Replying to: cararyarber (Oct 28, 2009 1:29 pm)
We are having the same phantom lock/unlock problem with our 97 jimmy. We left the back gate open for several hours, now the car unlocks & lock on its own, whether the car is on or not...even drained the battery last night. Any solutions??

#523 of 607 Re: 2000 Chevy Blazer Electric Locks [jeff1280] by cardoc50

Apr 06, 2010 (5:12 pm)

Replying to: jeff1280 (Apr 06, 2010 4:36 pm)
I remember finding the same problem in a GM TSB(technical service bulliten.The GM dealers service dept. gets these all the time.As a matter of fact,I found 42 TSB's on the vehicle. One was a problem excactly as you state. They did'nt issue
a recall on these problems in order to save billions.They instructed the service mngr. to fix these easy fixes when the vehicle was brought in for other work,hoping
the warranty would expire. It tells the mechanic to remove the trim off the left front door and run a jumper wire across a wiring connection. What a generic way to
proffesionally repair electronics.You should be able to bring the TSB's up on your computer.You will be amazed. But hey,I drive one too! If you can't find it, I'm sure
I have it on here somewhere so post a message if you can't. I live in WV close to where the Massey performance coal disaster happened. I know most of those guys and my twins work the midnight shift there. One is a mine foreman and he likes to
pile the work on his bro. I have'nt slept yet.They are safe.Thank GOD. So it may take a day or so to get back to you. Good luck and remember,I drive one too! LOL

#524 of 607 Re: 2000 Chevy Blazer Electric Locks [cardoc50] by jeff1280

Apr 06, 2010 (5:44 pm)

Replying to: cardoc50 (Apr 06, 2010 5:12 pm)
I couldn't find the TSB you were refering to. Any chance you could e-mail it to me? My e-mail address is kriechatt.net. Glad to hear your boys are safe. Thanks.

#525 of 607 Fuel issue with 2000 Blazer by amandap

Apr 11, 2010 (4:21 pm)

Hi,
  After reading many posts about the blazers, I also have had many of the same issues...the clicking sound in the dash ( which all your info. has been quite helpful). My issue is I have a 2000 Blazer and literally EVERYTIME I put gas in it, no matter how much, when I take off the truck is very hesitant and doesn't seem to want to move too well then it will just snap out of it and all will be normal again. We replaced the fuel filter and the sending unit. Any ideas? Thanks!

#526 of 607 Re: Fuel issue with 2000 Blazer [amandap] by cardoc50

Apr 12, 2010 (1:49 pm)

Replying to: amandap (Apr 11, 2010 4:21 pm)
Amandap, The symptoms you talk about is caused by the emissions/fuel system.
There has to be about 7lbs pressure in the fuel tank for the system to operate properly. When the pressure raises, the purge solinoid is activated allowing the pressure to be vented through the charcoal cannister which allows fuel or fuel pressure back to the intake manifold or tank. Of course when you open fuel lid any
pressure would come out.Of course that is normal on any vehicle. You seem to
have trouble building and sustaining the 7lbs of pressure. You may have a bad gas cap or the hose in the top front of the tank is not connected if the tank has been removed, most people don't know about that hose and it breaks off the plastic where it attaches and can't be fixed unless that plastic connector is replaceable.
I don't believe it is but I could very well be wrong.These vehicles have a complicated
emmision/fuel system. The reason I'm thinking that may be your problem is It happened to me.When I put in a new fuel pump,I didn't notice that hose and it broke off.I thought it would not make any difference being that everything else was
right and the least it could do was just give the tank a little air.That is when I learned it has to be hooked up.I bought a repair manual and learned a great deal of info from it.I bought a tank from the local salvage yard and it works fine.You say after a while it runs ok. That makes me think you might have more of a leak than
the hose off all together. I advise you have someone check your system to allieviate
any maybe's or if's. I don't think it's injectors or fuel pressure regulator.Have someone check that everything is connected as it should be.Oh, and one more thing,my hose that went to the cannister was also stopped up. I hope you can
have your Blazer's purge solinoid and the hose etc... looked at and be saftely on
the road again. I hope this helps. Good luck.

#527 of 607 Re: Fuel issue with 2000 Blazer [cardoc50] by amandap

Apr 13, 2010 (4:52 pm)

Replying to: cardoc50 (Apr 12, 2010 1:49 pm)
thanks so much for the info. Since you mentioned the intake manifold, my husband actually just replaced the gaskets 2 days ago...could that have caused the problem? Besides that I will certainly have what you suggested checked as well. Thanks again!

#528 of 607 Help charging problem by phoenix1968

Apr 27, 2010 (12:48 pm)

I have a 1995 GMC Jimmy. I have to contantly disconnect the positive terminal on the battery or it wont start in the morning. I have also noticed that while running the light for the daytime running lamps and the clock on the radio flicker.
 
Does anyone have any idea what I should be looking at to stop this problem. It is getting to be a pain to have to disconnect the battery everytime I get home from work or leave my vehicle at work.
 
If the battery is left connected I have to get the vehicle boasted.

#529 of 607 Parasitic battery drain by duntov

Apr 27, 2010 (6:31 pm)

You have excessive parasitic battery drain. All modern vehicles have some parasitic battery drain of about 10 ma which is normal. That is because of the sensors, clock, alarms, relays, acessories, etc. . If you have a shorted relay or damaged and shorted power supply wire, the battery drain can increase to the point it will completely drain the battery overnight and still will not blow a fuse. The only way I know how to isolate the battery drain , is to start pulling fuses while the engine is not running and watch a multimeter. Make sure all lights are off, such as the interior dome light or the glove compartment light. The cargo or dome interior light dimmer on the instrument panel can sometimes be in the "on" position and the operator will never realize it until the battery is dead. .
 
Example: I had a shorted power door lock relay on my 1991 S10 Blazer and it drained my battery overnight. I installed a new fully charged battery and I discovered the shorted relay when I attempted to lock the doors after I installed the new battery. The doors would not lock so I replaced the power door lock relay. I probably did not need the new battery. I purchased a 800 ma Deltran Battery Tender and I keep in on my S10 Blazer if it will not be driven for more than a week.
 
The charge light on the Deltran Battery Tender will indicate if you have a excessive parasistic battery drain. While the battery tender is connected to the battery, the indicator light will either indicate the battery is receiving a constant charge (yellow) to compensate for the excessive battery drain or it will indicate a green light to show a full state of charge. If the parasitic battery drain is excessive, the battery will never reach full state of charge and the battery tender indicator light will remain yellow. .

#530 of 607 Re: Help charging problem [phoenix1968] by cardoc50

Apr 30, 2010 (3:44 am)

Replying to: phoenix1968 (Apr 27, 2010 12:48 pm)
phoenix,I had the same problem with my 1997 Jimmy.There are differences in
wiring in about all models 1995 to 2004.Try pulling acc. fuse. It works my inside lamps and pwindows, locks,rear hatch.I think that is the right fuse. I would have the altenator checked first they are bad about shorting out. I had a short in the rear hatch wiring just above the headliner in the very back. There are several other
possibilities. Try that then just pull a fuse at a time to get it narrowed down.Then
you can go from there. I fixed one where the lower interior lights would'nt go out.
The glove box, and lower foot lamps under the dash. Just start narrowing it down
by the fuses and go from there. Good luck.

Messages Page 53 of 61

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