When the engine reaches operating temp the engine starts to misfire and loses power

Tiny
DMEL340
  • 1994 DODGE DAKOTA

The engine was rebuilt 10,000 miles ago. I did perform a compression test and it has 150 psi on each cylinder. It is a V6 3.9 MPI. There are no codes showing on the computer. I checked for 12 volts at each injector and checked the wiring per instruction book back to the computer connector. I installed a new coil. It has new water temp sensor. I had rechecked the timing in the distributor and verified it was correct. I installed a rebuilt computer in case the board was breaking down. When the engine is warm and I go to test drive it and put it into gear is when I start to notice the popping in the exhaust system. Upon accelerating it feels like it is dropping cylinders. It does not have any power. I did not try driving it when it is cold yet, but I will. I need help. Any suggestions?

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Wednesday, August 1st, 2012 AT 11:10 PM

3 Replies

Tiny
HMAC300
  • EXPERT
  • 45,743 POSTS

Check the fuel pressure 35-45 psi. Also check vacuum on intake if 15" or belwo suspect a clogged converter

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Wednesday, August 1st, 2012 AT 11:17 PM
Tiny
DMEL340
  • MEMBER

The truck has new fuel pump and is at a steady 40psi. The cat is new and I did separate at inlet side inspected and used a shop vac on blow and it flowed free.

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Thursday, August 2nd, 2012 AT 12:15 PM
Tiny
HMAC300
  • EXPERT
  • 45,743 POSTS

Check for vacuum leaks with choke cleaner and check resistance of injectors they should be 13.3-15.7 ohms. The only proper way to check injectors for voltage is with anoid light.

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Thursday, August 2nd, 2012 AT 1:16 PM

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