jkm211

alright so my issue. like the title says, i am running rich. hooked up an aem wideband and i am running 10 at idle and wot.

info on my car
92 cx
b16a2 with skunk2 pro black I'm
stock fuel rail
ls injectors
chipped p28
93 octane at all times

so bought the car with the chipped p28, assuming the tune was the issue put a b16a base map on it. same issue. when my map sensor is hooked up it idles around 3k. when it is not on the tb but still hooked up electrically i idle at around 700. i throw no codes with my p28 with it setup this way. so today in an attempt to solve this issue, i take my buddies chipped p06 with a gsr tune, hook my map sensor up to the tb. starts, idles at around 1k, runs at 10.5 at idle. but then i throw code 3. so i take the 4 bar map sensor i have in the garage and hook it up. car starts but dies the second after it turns over but the cel goes away. so i hook my p28 back up and it does the same thing. I am extremely frustrated at this point and have tried everything i know of. so please help. also, i have determined that a vacuum leak is not the issue with the high idle.

Birdsc

Issues with the fuel pressure regulator perhaps? Your fuel pressure could be too high for some reason.

jkm211

that is possibly the only thing that i have not done. but it is a stock fpr. i am open to thoughts on this as the issue.

jkm211

Fpr did not fix the issue.

Former User

Are you saying that code 3 is thrown with everything connected and the chipped P28 installed?

jkm211

No it wasnt throwing with the p28 but was with the p06

Former User

High idle
Check whether the throttle cable is adjusted too tightly (there should be some slack) and also clean the throttle body.
Have you checked for an intake air leak from the IM or TB gasket?
If you cover the hole in the TB leading to the IACV, does the idle speed drop?
Do you have an FITV?

Running rich
Are the LS injectors the same spec as the stock B16a2 ones? Is it possible they're pushing too much fuel?

jkm211

Throttle cable is not to tight, ive adjusted it several times, I have fixed all vac leaks in around the intake. I do not have a fitv, I have cleaned and replaced the tb, replaced map sensor, tps, and iacv.

I was under the understanding based of injector charts ive seen on here they were the same injectors. I am assuming that the richness is being caused by whatever is causing my high idle.

Former User

When the engine is high idling, can you kill it by cover the top of the TB? Can you lower the idle speed by covering the hole inside the TB leading to the IACV?

jkm211

Yes I can kill it and I havent tried covering the whole inside the tb going to the iacv. I can try that though. If does drop the idle what does it show? Dirty iacv?

Former User

Is it possible that somebody messed with the throttle stop screw, causing the TB plate to be open too wide at the closed position?

^This or a faulty ECT sensor or TPS.

jkm211

Ect - engine coolant temp sensor? If so replaced it. That was the very first thing I did along woth adjust the idle set screw.

Former User

The 2-wire one below the distributor? I ask because the engine has 3 ECT sensors.

jkm211

Alright I know I only replaced the one.

Former User

Running rich
Are you using an aftermarket or stock fuel pump? Have you measured the fuel pressure?

jkm211

I was running oem now running walboro 255. I have not measured fuel pressure.

Former User

It's possible, but they could also be separate issues.

Given that the engine is running rich, measuring the fuel pressure and testing the FPR is probably a good idea.

jkm211

I have cleaned the oem on that came with the car, replaced it with 2 known to be working correctl fpr. Is there a way to test it other than going and buying a gauge?

Former User

Measuring the fuel pressure requires the gauge, so you also test the FPR while your at it.

You may be able to get a free rental of the gauge and adaptors at AutoZone.

jkm211

Alright. Assuming that the fuel pressure is high what is my course of action to get it in spec. Dont havw the extra cash right now to spend on a adjustable fpr.

jkm211

Ok. Got the richness figured out. When I hook my map sensor up as it should be I go between 13 and 14. But still have the high idle? Any other ideas that I havent done. Also, when I hook up a good 4 bar map sensor it goes from running good with a high idle to running lean 17+ and barely stays running. Another rhing I did just for kicks was swap the tps and map plugs, started, idled normal, but ran rich. Should it have done that?

Former User

What did you do?

There are tests I mentioned for the idle problem that you haven't yet done.

Be careful. Swapping around sensor connectors can blow your ECU. If you want to ensure that a sensor is connected to the correct connector, match wire colors to the sensor.

jkm211

I simply plugged my map sensor up and went and drove around town. A trip that typically would have taken around a 1/4 of a tank just barely moved my needle and the wideband showed consistent readings.

Im sorry I forgot about that. Where are the other two ects located?

Former User

The ECT sensor issue is settled if you replaced the 2-wire ECT sensor below the distributor and you read proper engine temps with a scan tool or software.

But there are other idle related things I mentioned earlier. Reread my posts.

Former User

So previously, when the engine was running rich, you were driving around without the MAP sensor plugged in?