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Check engine light came on, right after I noticed a thud when transmission upshifts

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While merging onto the highway when my car hit 3 and 4th gear the engine seemed to "stutter/misfire" during harder acceleration. Check engine light also flashed briefly during hard acceleration. Dur

Could be a transmission problem or something as simple as bad spark plugs.
The engine is under the most load when RPM is low and you are trying to accelerate, such as when it upshifts.
You should have the computer checked for trouble codes and hopefully that will point you in the right direction to test.
If the spark plugs have more than 50,000 miles of wear you might start with replacing them.

Feb 06, 2013 | 2008 Saturn Astra

1 Answer

"transmission "slams" sometimes when upshifting.

you have bad transmission mounts, they are a bit difficult ot replace on that model of Buick as the front mount is in a tight area that requires the engine to be lifted up, out of the engine cradle.

Apr 20, 2011 | 2000 Buick Park Avenue

1 Answer

I have a 1987 jetta and i want to get my up shift light working again i hoping it is just a blown fuse?

It could be the upshift indicator control unit relay (relay #4, second row of relays, 4th from the right). There is also vacuum switch upshift indicator, (usually connected inline of the vacuum line going to the distributor advance, with an electrical plug connected to it). Or it could be transmission switch/upshift indicator, (located on top of the transmission, towards the back of the transmission). I don't think it would be a fuse, because the upshift control unit relay is powered by ignition battery.

Oct 29, 2010 | 1987 Volkswagen Jetta

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There is a thud thud thud nin the front end of the

Cant rule that out. If car has ever been in an accident you want want to check the engine mounts also. This sometimes sounds just like a transmission going out of a vehicle.

Nov 09, 2009 | 2002 Kia Sedona

2 Answers

When my 2004 Ranier is idling sometimes I hear a 'thud'

Possibly 2 conditions at once. If it is sitting at an idle and you hear the thud noise, it very well depends on where you are hearing it but it almost sounds to me like maybe occasionally the is backfiring.I would personally if this is the case, Take air filter housing away from the motor and check the throttle body for a buildup,check air filter, and try some fuel treatment.If you have no check engine light it is not mis firing, but it could be exhaust related.

Oct 02, 2009 | 2004 Buick Rainier

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Thud noise / jolt when transmission.......

Yes, I would get the transmission checked it sounds like it maybe getting ready to go out. Take the dipstick out & smell the fluid to see if it smells burnt...Hope this helps..


Jul 23, 2009 | 1983 Toyota Land Cruiser

2 Answers

2006 Toyota Land Cruiser - Thud when coming to or leaving stop

Most likely coming from motor mounts or transmission mounts. You should have these checked right away to avoid and consequential damage.

Jul 22, 2009 | 2006 Toyota Land Cruiser

1 Answer

2005 Kia Optima auto trans problem

I had the same problem... just got my car services and took car to transmission spec. they told me that its the pump inside the tranny thats broken or something. while the pump is working >ie under acceleration it blows fluid out the seal (which seal im unsure) once the fluid level drops below the seal level it wont blow as much fluid out. if you check the levels you should notice that the fluid is well under level. Major job because you need to remove the transmission to get to the problem If that isnt the problem another issue could be a seal on the left or right driveshaft.This isnt as major as the other because you wont need to remove the transmission but time is required to remove the driveshafts to replace the seals. The first problem cost me about $600AU

Sep 18, 2008 | 2004 Kia Optima

1 Answer

Transmission trouble

Transmission model is a 4R70W,totally electronic,no vacuum to the trans.A common failure on that transmission is the 1-2 accumulator springs...they break,causing a harsh 1-2 upshift.An accumulator is a mechanical/hydraulic assembly also called an accumulator piston.It is made from steel with rubber lip seals bonded to the steel.The accumulator piston takes a certain portion of the hydraiulic fluid produced when the 1-2 upshift happens,and strokes up and down with springs providing resistance.It acts as a hydraulic shock absorber for the 1-2 upshift,providing cushion.When the springs break,it no longer provides shock absorption,hence the harsh upshift.It is located just inside the trans pan,on the passenger side front of the case.It is retained in the case with a cover and a round snap ring about 2" in diameter.A new piston and springs can be purchased from a transmission repair shop,or better yet,have them check the assembly for broken springs.Good luck

Sep 04, 2008 | 1999 Ford Crown Victoria

3 Answers

Transmission/Check Engine Light/Speedometer

if your gauges dont work then hit the dashboard (no love taps or full strenth hits)

Jun 07, 2008 | 1998 Dodge Caravan

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