If it always, under acceleration, reguardles of what gear you are in, it is must likely, your ignition wires. If it's while coasting, past 45, vehicle in fourth gear, then it would be an isue with your trans. i.e. trans coming in and out of fourth gear or a torck converter clutch problem. Should have codes. If so what are they?
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Mar 17, 2012 - 19 posts - 7 authors
[Archive] Enginge surges RPMS drop while driving OEM Issues. ... I so hope somebody has a clue as to what is causing my '02 Envoy's (182k) engine to ... I'll be driving and when I get up to around 35 - 45 MPH sometimes my ...
ASR is your traction control, the reason why you have a surge is that the ASR is calculating how much force to give to each tire based on sensor data, and this takes time. When you turn it off, the acceleration is treated like any other car with out traction control. The 2000-2003 Camaro had one big complaint, a laggy traction control. You could potentially fix this by replacing the computer unit with a faster aftermarket model and changing sensors out with more efficient models, also tuning the engine can help reduce lag time or acceleration delay.
You have two problems. The surging is from a dirty throttle body and /or air filter. The selector light could be from a bad selector switch or internal transmission problems. Have the car scanned for codes.
Did the 'Check Engine' Light come ON? Whenever the 'CHECK ENGINE' light comes on, the ECU (Engine Control Unit) sets a Diagnostic Trouble Code (DTC). These codes identify the particular engine management system which caused the light to come on. You'll need to use/find an OBDII (On-Board Diagnostic) Scanner to retrieve any code which have been stored in the ECU computer. Afterward, we might be able to help you DIAGNOSE and perhaps eventually fix the problem.