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Alright Tech Heads...help?

 
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Old 04-08-2011, 06:05 PM
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Alright Tech Heads...help?

Ok all, this is a friend of mine, and this is actually my old car he has, and we're both stumped. To boot, he is an ASE certified mechanic, so I'll let him explain all the details:

93 Prelude
2.3 5spd

I go out and start it runs rough for 15 seconds then smooths out. Pull out and drive it, runs awesome, pulls hard with accelerator to the floor. As the car warms up to operating temps the hesitation begins until any time throttle is brought off idle (barely touched) it falls flat on face.
Oxygen sensor monitor shows lean as throttle is applied.
I have a factory service manual for year and make.
Items checked:
ECT shows correct resistance at operating temp. OK
TPS 0-4.5V OK
IAT .942 Kilohms OK
CKP 402 ohms
TDC 408 ohms
CYP 394 ohms
MAP (I have 2 there is no change in the drive ability)
HO2S (monitor shows proper signal rich - lean - rich etc... OK

DTC EGR code 12 (involves lift sensor should not affect performance seeing how I have no EGR valve)

OBX short ram large plenum intake (ported and polished)
Skunk throttle body 70mm
Mugen chip

to me I feel like injector duration is lost, any of the items listed above could cause issues but they all seem OK.
my 3 final suspects:
ECU (not sold on the ECU being bad because it ran fine for several months after the modifications)
Distributor (all the sensors have correct resistances)
Mugen chip (lost profile)


Any ideas?
mark


Thanks guys,
Kevin
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