1995 Monte Carlo surges mainly at highway speeds

AIRWALTON

MEMBER
1995 CHEVROLET MONTE CARLO

The problem usually starts after I have driven it for awhile.I will be driving 60 mph or a steady speed where overdrive is in play, and then try to speed up a little bit and then it will surge back and forth. I can kick it in the arse and it will stop surging until I'm going a steady speed and try to slowly increase the speed. I have replaced the EGR, TPS, Wires, Plugs, Fuel Filter, Main Computer. Cleaned out the port under the egr because it was clogged completely. The surge doesn't feel like the tranny is slipping.I'm not getting any codes. This car doesn't have a MAF. Could it be something to do with the torque converter or? I would say it something to do with my overdrive, but it will do this even if I leave it in drive. Any help would be grealtly appreciated.

2 Replies

MVANNESSJR

MECHANIC
223 POSTS

Is the engine temperature sensor following the surge? If the engine temperature sensor is failing that could cause the torque convertor to do some wierd things as the car is not designed to not lock if the coolant hasn't reached 120 degrees. If it is reading the temperature improperly it may cause the torque convertor to lock and unlock. Another thing is to check your vacuum lines, specifically the manifold vacuum line for leaks or cracks.

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Sunday, February 5th, 2006 AT 10:33 PM

AIRWALTON

MEMBER
2 POSTS

I checked for vacuum leaks and found none.I'm not sure what you mean by engine temperature sensor following the surge, but the car is reading normal on the temp gage.
Today I was driving home with the usual surging back and forth in drive and overdrive.
I made a stop on the way, left it running (in park).I got back in and started driving, once I reached 50mph I noticed it wasn't shifting into overdrive and the surge was gone so I accelerated to about 70mph still no shift or surge but when I would let off the gas it would drop to about 1000rpm's kind of like it was coasting in neutral, then when I hit the gas again the tranny wouldn't engage until 3000rpm's and I was doing 50mph.
This has happened a couple of times before, and if I shut the car off and start it back up the tranny shifts into overdrive and all my surging is back.
I'm completely stumped, as it seems to be electrical.I have looked through all the connections to the tranny. Any Ideas?

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Tuesday, February 7th, 2006 AT 7:43 PM