m20 2.7i no power after 5k rpms cutting out

[jlevie]

When the engine passes 5k and misbehaves, does the tach or econometer react?

If the tach drives towards zero, the DME is loosing timing data, loosing power, or the DME is bad. If the tach doesn't react, but the econometer dries towards zero there is a problem with the fuel system. A bad or flaky CPS, main relay, fuel pump relay, ignition switch are possibilities. Or the DME or engine harness could be bad. C191 (below the intake manifold) is known to cause problems.

A general lack of performance above 5k could be a bad WOT switch in the TPS. But that won't cause sudden "cuts".

[e3027sedan]

sorry i have alot of questions but i changed the ecu and it still ran the same so it cant be that....main relay fuel pump relay? i thought a relay couldnt go bad like either on or off not sometimes working or cutting out correct me if im wrong.....what is c191? thanks for the help still struggling with this problem im going to check the timing today see if maybe it jumped...bump for more help!

[e3027sedan]

changed my pan today and swapped out the plugs and cps thats what it was runs perfect now thanks for the info everyone!