ECU Issues At Hand - Honda Forum / Acura Forum

TurboD16 · 01-21-2003, 10:31 PM

Guys, i'm having a odd problem with my engine.

At a certain throttle range (about 35-65%) my A/f ratio meter drops off as to not even display a reading (led lightshow, BAH) and picks back up when close to WOT. I checked the sensors, and everything looks to be all good. The TPS checks fine even with an analog VOM (will twitch with an open circuit unlike slower reading digital meters that might not see it so fast) and here's whats really odd; my MAP is showing .66 Bar from the S-AFC, yet my boost guage just 6" away from the TB is saying 15-18 psi. Going by the rule that MAP divvys A/F and not TPS, wouldnt I be leaned severely if i was actually making 15 psi ? I have a 5th gen greddy hairdryer, intercooled on a 97 civ cx stock block/head thats been fully re-built and forged and balanced with all the goodies. ECU is stock but re-tuned (bullshit) from JET. Before i raised my CR back up from the 7's (.080" GREX gasket) to 8.5:1 with a stock .026 gasket, and didnt have a cat cause it got clogged at one point, the car actually wouldnt produce good boost at WOT, i had to find a sweet spot in the throttle that it ran full out boost at. that issue is mostly in the past, but the A/F measurements dipping out, and the conflicting boost presure readings are still confusing me. Any help is greatly appreciated. Looks like i found a serious bb to post on. You guys rock.

y0j0hn · 01-29-2003, 08:30 PM

hey man, im sorry i can't really answer your question b/c im not turbo'd but i do have a question and ( a free bump so you get your Q answered ) Do you think that your cat got clogged up from the greddy kit's blue box? thanks..

TurboD16 · 01-29-2003, 09:33 PM

I had ran the car way too rich from the get-go, but always thinking it was leaning out. ECu codes proved me wrong. I have a new cat on it, and raised the CR back up to 8.5:1 and the black smoke is still there despite cranking the fuel way down. gonna swap to a P28 or get my 2nd o2 plumbed in after the cat so it will read it every so 15 sec and NOT trigger a CIL rendering my S-AFC a useless light show. Putting the boost guage reading down under the TB in the manifold; making about 6 barbed fittings coming out so every vac/boost related item like FPR, FMU, and BOV can all have their own seperate air sources. should work a lil better before too long.

y0j0hn · 01-29-2003, 09:40 PM

oh okay i see..well sounds liek you know your shit, good luck

flip1199 · 01-30-2003, 04:22 AM

Has your car been tuned??? What a/f gauge is it??

TurboD16 · 01-30-2003, 11:17 AM

I have yet to get some dyno tuning time, but it will be soon... and free at that. I need to reset my timing to make up for the lack of thicker head gasket (about 2 deg. ) and move the cam gear up to 10+ (20 deg. on cam) for maximum cylinder pressure to spool the little hairdryer up. I cant get more than .66 bar (9 psi roughly) outta the 5th gen greddy turbo. I have the gate springed up better than a hood on a 60's impala, and the wastegate valve fully capped off to not let air in or out. I am about ready to put a #16 drywall screw thru it and run unregulated boost!

My a/f meter is a POS autometer deal. i should read from a EGT or wideband, but thats down the road a bit. its my daily driver till warm weather and the bike is back on the road.

Joel