weird hesitation issues

[kman_e30]

after my car warms up it starts hesitating at around 2000 rpm then goes back to normal, and then at 4000 rpm it starts to hesitate again. so far ive changed the the fuel filter, and the fuel pump relay, and tried swaping afm's with my other e30, but nothing yet. any ideas? this is an m20b25 engine

[jlevie]

The low speed hesitation could be intake leaks. But the high speed hesitation is something else.

[kman_e30]

ok so now the car wont start at all, the motor wont turn over at all, the fuel pumps come on, but no starter, any ideas, dme maybe?

[paperplane94]

Make sure the starter is well connected. Then find out where the starter relay for your model is and swap it with another similar relay.

[kman_e30]

a little bit after my last post i swap the main relay from my drift car into the daily(the car im having the issues with) and it started right up, and i didnt have any hesitation issues when i drove it. i put the main relay from the daily into the drift car, just make sure it was bad and that one started right up too. wtf is going on?
also both cars are m20b25 swapped

[paperplane94]

Drive em around some more. One of the two ECU's is running on default settings.

[kman_e30]

well there is nothing wrong with my drift car. the problem is with my daily driver, i actually have only had the car for a week. im just swaping parts around because they both are m20b25's and one car is running normal and the other isnt. sorry i should have clarified that. but what do you mean by a default setting on the ecu?

[kman_e30]

ok the problem is still occuring, im thinking maybe the coolant temp sensor. my old e24 did some weird shit like this at one point, and it turned out to be that. anyone else agree?

[kman_e30]

still having the problem, so far ive tried, fuel filter, main and fuel relays, dme, afm, fpr, i guess next ill try on the external fuel pump.
any help would be greatly appreciated