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Pickups Chevrolet Silverado & GMC Sierra GMC Sierra: Problems & Solutions 
1492 messages, Last post on Oct 12, 2006 at 5:32 AM
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I have a 1998 GMC Sierra with a 4.3 v6 and manual transmission. When I push the clutch in when coming to a stop or while changing gears my rpm will either surge or stay where it was at while the truck was in gear, only coming down to a normal range when the truck comes to a complete stop. I recently replaced the IAC valve and it seemed to fix it for a little while and then I slowly started having the same problem again. It's also more noticeable when the a/c is on. Is there anything else I can check/replace, or do I possibly have another bad IAC valve? Thanks for the help.
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Replying to: pdana (Sep 21, 2005 12:42 pm)
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Replying to: weels (Sep 21, 2005 6:07 pm) |
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Hi all.. I just bought a '91 GMC 2500 5.7 Liter V8. Its a nice truck in and out. Excellent condition. great running condition. Lots of power. Smooth running truck. Idles nicely even at startup. No hiccups. Nothing to indicate anything was wrong. Its been very well cared for over the years. Except. I'm getting 5 MPG!!! yes FIVE! I dont know what's wrong. It was just smogged on thurs. It passed. I can go 30 miles and use up a 1/4 tank of gas. Its a 22 gallon tank. If its getting 5 MPG empty, I'd hate to see it pulling a loaded horse trailer!!!  Does anyone have any idea why its such a gas hog?? Its killing me. I'm just glad this truck isn't my main transportation. I wouldn't be able to afford to even go to work! Lisa
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ive had several eletrical problems:first side mirrors will not adjust electrialy :second pass. door lock will not work electrically but will work manually. third heat control problem can turn up or off but not down now the most serious last night i was woke by watch dogs to find the truck trying to start it self. meaning the starter was cranking the engine but since the ignition switch was in the off position it would not start. then the starter got hot from cranking and began to smoke ALOT. to stop this from happening i had to diconnect the battery. after i but a new starter what should i check next so this does not happen again? the starter has been replaced with a new starter due to previous accident 
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Replying to: lisalmu (Sep 24, 2005 9:25 pm) - Tim |
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FYI Just a note for the Do_it_Yourself'ers. I just finished changing the internal Filter in my 2003 GMC Allison Transmission, actually a piece of cake, no external attachments to remove, drain plug in pan actually works and all pan bolts are easily accessible. The internal filter is about $29.00 and the external spin_on was about $20.00. I could not find the capacity listed anywhere, but to let you know, it was approx. 10 quarts.
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Replying to: gmboy1 (Sep 25, 2005 2:08 pm) "Fill after rebuild, 12.7 qts." and "Fill after fluid and filter change, 7.4 qts." Don't know why the discrepancy. You might double check the level being sure to use the procedure as stated in the Owners Manual. Kinda complicated. Curious about the internal filter you mentioned. Can't find anything about it in the S.M. Is that its official name? BTY - If there's an Allison dealer near by, you can get those spin-on filters for about $9.00. -David
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Replying to: noobie1 (Sep 25, 2005 5:19 pm) Bob |
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Replying to: sprintcar1 (Sep 25, 2005 5:11 am) |
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