Question about 2002 Pontiac Grand Prix
About 5 months ago I started my car and the speedometer needle pinned all the way to the right. I shut the car off and restarted,every thing was fine. It happened about once a month but I didn't bother with it as I was going to get another car, but plans change. The car is OK in the morning, I can drive about 20 miles before the speedometer needle starts wiggleing and the transmission seems to be searching for the correct gear. I've owned a car that had a slipping transmission, this problem doesn't feel the same, I don't lose speed, just slightly higher engine revs, and a temporary drop to a lower gear. It isn't a constant problem,it will happen and then be normal for 5 or 6 miles.In the morning it happens sooner than 20 miles if I park the car at a store. When the trans problem started I ran a tube to the bottom of the trans pan pumped out some fluid, and added a bottle of lucas treatment [didn't help]. The fluid I pumped out wasn't dark, didn't smell bad and had no particels. A friend who is a hot rodder says I need to put a new trans filter in and a new speed sensor and that will solve the problem. The guy that owns the local transmission shop tells me I need a transmission over haul and that I would be wasting time and money with the new filter and speed sensor.Any ideas on this, thanks
Your friends comments are good advice, but first did you check the trans fluid level when you checked the condition etc of the fluid ? as low fluid could cause these symtoms,if the level is ok i'd then get the OBD codes read as this will show what sensor/switch may be faulty ie the speed sensor mentioned by your friend but by doing the OBD you will have a diagnostic result,keep me posted
Posted on May 09, 2014
Testimonial: "The level is fine, what would you expect to pay for a code reading at a shop?. Advance auto parts doesn't do diagnostics on a car of my vintage. It's a 1992 chevy lumina 3.1 4 speed. It's high miles but all county driving, constant speed ,very little stop and go. Thanks"
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Posted on Jan 02, 2017
SOURCE: Trany would slip at high
Replace the ranny oil, dont flush it just drain it throught the trany oil pan and replace the filter and gasket then refill the tranny with type F oil this should stop the slipping
Posted on Oct 23, 2008
SOURCE: transmission speedometer problem
This all can be caused by a defective Vehicle Speed sensor, also called a VSS, also run a test on the computer to see if any codes are in memory that will help to sort this problem out.
Posted on Nov 08, 2008
Check fluid level and see if it smells burned. If you do not work on it yourself, have a good reliable trans shop check it out. Usually the repair shop you use can recommend which trans shops do good work.
Posted on Apr 14, 2009
replace fuel pump relay.if it still loses power. check fuel pump pressure.if all good scan it check for egr valve going bad.
Posted on May 25, 2009
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