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Chevy Blazer/GMC Jimmy

508 messages,  Last post on Oct 04, 2009 at 2:53 AM

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#497 of 508 Re: Roar at cold Start [joeblazer02] by brokenarrow1 Apr 14, 2009 (12:33 pm)
Replying to: joeblazer02 (Jun 13, 2005 7:03 pm) My 98 did it and my 02 does it. A guy drove by my in front of the gym and his was doing it............I think they all do it. Someone told me that the fan clutch is engaging..I don't know other than they all do it. Replies to this message: jlflemmons (Apr 15, 2009 7:31 am)
#498 of 508 Re: Roar at cold Start [brokenarrow1] by jlflemmons Apr 15, 2009 (7:31 am)
Replying to: brokenarrow1 (Apr 14, 2009 12:33 pm) All of the 4.3L engines do it, not just the Blazers. It is the fan clutch. No slippage when cold at startup, but will disengage within a minute or two. If it continues to roar, turn off the engine and see if you can move the fan by hand. If you can move the fan with only a bit of resistance, your good. If it doesn't turn, or takes a hard effort to turn, it is probably time for a new fan clutch. Running with a locked up clutch will affect your gas mileage, so it is worth changing.
#499 of 508 Give UP...almost by keanijoe May 26, 2009 (9:54 am)
I've spent days reading the forum here trying to figure out my truck,,,symptons are as follows...takes 3 attemps to start the truck when cold...just cranks until I try three different times...at low rpms the engine misses bad..If I floor the pedel it runs fine...on highway when I set cruise...engine starts to jump and miss..bad. sometimes the SELight comes on...other time it doesn't I've taken it to 3 mechanics....no one can figure it out...Have gotten two codes...MAPS sensor bad...Replaced...fuel pump, dist, cap rotor....plugs...wires....crank sensor...cam sensor..ignition lock assembly...One mech already told me the CAT was fine.. Any help would be appreicated as I am at a loss...Planning on giving this car to my kid next month but it has to run right first...thanks again for any ideas.... oh I forgot...replaced the computer...also...got a code once that says engine is -7 degree on timing...can't adjust since the bracket is notched and holds dist in postion...also...sometimes the cruise works..sometimes doesn't...and sometimes only one side of the speakers play...help please..... Replies to this message: jlflemmons (May 26, 2009 11:07 am) keanijoe (May 28, 2009 2:13 am)
#500 of 508 Re: Give UP...almost [keanijoe] by jlflemmons May 26, 2009 (11:07 am)
Replying to: keanijoe (May 26, 2009 9:54 am) Because of the starting issue, I would wonder about the fuel regulator. I know the V8 engines had a problem with the regulators leaking and causing hard starts, bad idle, poor low rpm performance. Replies to this message: keanijoe (May 28, 2009 2:13 am)
#501 of 508 Re: Give UP...almost [jlflemmons] by keanijoe May 28, 2009 (2:13 am)
Replying to: jlflemmons (May 26, 2009 11:07 am) thanks....I will check inot that....this is driving me nuts..
#502 of 508 alarm keeps going out by chewchang Jul 01, 2009 (3:41 pm)
My alarm goes off about every two or three hours and the inside lights stay on inless my dome overide switch is preesed,any ideas?
#503 of 508 Confusion sets in...1995 Gmc Jimmy by mmorga24 Sep 23, 2009 (6:33 am)
Ok here is the problem... I was first told that the problem started in my fuel pump by some shabby Meineke mechanic. He was wrong I took of the fuel filter and replaced it... It was horrid, so when the fuel filter was off we checked the fuel pump and it shot out gas with pretty high pressure. I called a mechanic and asked him about maybe the relays needing to be changed out to he say negative. OK my fuel system seems to be moving around gas, but my car will not start. The other day starter fluid did work and I got my car running. When my car was running there was no stalling or sputtering. I drove it around and used a can of seafoam to clean out the fuel system blah blah blah. So now I am curious could it be just a fuse or fuses, or faulty wire somewhere. I need some help before my head explodes Replies to this message: angieandrohan (Sep 23, 2009 6:54 am) mmorga24 (Sep 23, 2009 8:23 am) jlflemmons (Sep 23, 2009 10:49 am)
#504 of 508 Re: Confusion sets in...1995 Gmc Jimmy [mmorga24] by angieandrohan Sep 23, 2009 (6:54 am)
Replying to: mmorga24 (Sep 23, 2009 6:33 am) OK if I understand this you, spray starter fluid in the throttle body and it started and keep running for the day, I had the same problem and it was my fuel pump it will work but needs help to start, after about a week doing that it quits and would never start again, after putting the new fuel pump in, no problem, change the fuel pump and your problem should be over. let me know if I was any help. Replies to this message: mmorga24 (Sep 23, 2009 8:23 am)
#505 of 508 Re: Confusion sets in...1995 Gmc Jimmy [angieandrohan] by mmorga24 Sep 23, 2009 (8:23 am)
Replying to: angieandrohan (Sep 23, 2009 6:54 am) ok thanks man, I am getting the fuel pump changed more than likely sucks though...I thought I had it fixed then it zonked out on me.. ugh. Did you have any other problems after this?
#506 of 508 Re: Confusion sets in...1995 Gmc Jimmy [mmorga24] by jlflemmons Sep 23, 2009 (10:49 am)
Replying to: mmorga24 (Sep 23, 2009 6:33 am) Okay, before you change the fuel pump, get where you can listen to the fuel tank and have someone turn the key to RUN, not start, and see if you hear the fuel pump run for a second or two and then stop. The fuel pump runs a "prime" cycle to pressurize the fuel system before starting. Once the engine starts, a different circuit kicks in and keeps the fuel pump running. The clue here is that if you shoot starter fluid to it, it starts and then runs okay.   Another dirty little trick; if you do not hear the pump "prime", take your foot and kick the bottom of the fuel tank. Don't try and cave it in, just give it a good thump. Then cycle the key and see if you here the pump prime, and start. Common failure in GM fuel pumps for years is that they get "stuck" and won't spin up. Give 'em a good thump and they will work again. For a while. Once they get to this point it's time to change them out. I have seen this on pumps with less than 50K miles on them.   Good luck

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