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Engine stumbles when first turn it on for about 5 mins after that car runs good , done a ton of work to it just can't figure out the shake .

03 kia Spectra ... have replaced motor mounts , motor . trans , plugs , wires , timing belt , cleaned out o2's new muffler ect... if anyone can help I would really appreciate it ...thx

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Sounds like the ECT, Engine coolant temperature sensor. But you changed the engine, Unless you took the sensors off the old and put them on the new? Then the other thing I think about is the wiring for the engine. And one other thing is the computer for the engine. You didn't give any codes..The engine light must be on?

Posted on May 13, 2014


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Posted on Jan 02, 2017

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SOURCE: I need to replace the

Rio 1.5L has 3 engine mounts (2 rubber mounts: Passenger, and transmission mount). If you have done motor mounts in other cars you should not have any problem. The only thing is: I've hard time to find Rio's parts in SA,TX

Posted on Sep 03, 2008

  • 7 Answers

SOURCE: 85 trans am 305 mpfi rough idle at start

check your Temp sensor for the ecu. could be out of spec at lower temps but not enough to send a code "You know -40 is possible and won't send a code"

Posted on Nov 12, 2008

  • 111 Answers

SOURCE: car dies when driving,check engine light comes on.

There is a good chance it could be your fuel pump , however if the check engine light is coming on and the dealer cant tell you what is wrong , try a different dealer or another shop. Second opinions never hurt.

Posted on Dec 12, 2008

  • 141 Answers

SOURCE: bad stumble on acceleration pops through t- body.

Sounds like the fuel pressure regulator. Could also be that the timing jumped. But I'm leaning towards the pressure regulator. Hope that I could help. Best wishes.

Posted on Jan 17, 2009

  • 189 Answers

SOURCE: 03 kia optima cost to replace timing belt??

will cost you about $500 this includes parts

Posted on Apr 14, 2010

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Some makers used Vacuum releases for their emergency brakes which had a Vacuum switch connected to the shift assembly. This would account for a stumble if Vacuum vented out through this switch.

More common for shifting stumble to occur from Park to Drive, engaging a load on the engine, not to stumble to a freewheeling Park position. Sounds like idle speed control is sluggish to stabilize the motor.

You also have idle speed control problem with A/C, kind of shows that A/C was what kept the engine running because when you turned the A/C off, the car died.

I am going to give you some Websites for wiring diagrams. amd with free wiring info upon registering your vehicle.

It seems that the base Idle speed control is not working and the A/C idle speed control is.

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