RB25 >> Hesitation @ Idle >> Hesitation when throttle pressed >&g

[s14sport]

Hi All,

I have an S14 with RB25DET Series I swap.

Greddy Intake ManiGreddy RS BovGreddy IntercoolerZ32 MAFStillen IntakeQ45 TBApexi PFCGP Sports 3" ExhaustMegan Racing DP

I swapped the engine in and got alot of the bugs out of it. I have been driving the car around alittle bit everyday for a few weeks and the engine felt & sounded great. Then one day hesitation started and felt like I lost all power. I pressed on the gas and the car felt like it was about to stall. So I took it home and I realized I never changed the spark plugs at all. So I put in some NGK plugs gapped to .08 and started her right up. Sounded great. Drove great again. This lasted about a week. Then I started her up again and I got the same exact problem. So I thought I knew what it was and changed all the coilpacks. Figured this must have been the problem. No avail....still having the same issue. Then I tried changing the ignitor and still same thing. Anyone have any idea what could be causing this? Thanks.

[240z4u]

Have you monitored your PFC hand controller to view your engine temps and other vitals?

Sounds like a bad sensor connection.

Were the plugs black? Change them again.

Car running rich? did you setup the PFC for your z32 maf right?

Evan

[s14sport]

yes i monitor the PFC

these are values I've been getting:

engine temp @ idle ~77 Cengine temp on highway ~94 Cknock sensor levels normally around 20-40 range..sometimes weird and spikes to 70 when I'm not even giving much gas at allRPM at idle ~950

The old plugs I took out were really worn. Not black but a couple were brownish. I will check the plugs again.

I have set the PFC for Z32 MAF and the car isn't running rich.
Modified by s14sport at 4:00 AM 9/12/2007

[ANVIL]

whats ur fuel pressure set at? i dont get any black smoke when i rev mine

[s14sport]

Fuel pressure is stock....I don't have an adjustable apr. Actually...I don't get any black smoke. I had a brain fart...I'm gonna edit that.

[s14sport]

[240z4u]

I think your problem is 94c cruising.

Thats pretty damn hot! My car starts running like **** when it gets that hot.

Time to investigate cooling, there is a good thread posted around here about that stuff.

Evan