RotorJoe

Well this morning I started up my FD and the idel was very low and very rough (600-700 RPM, and bouncing). I tough it was due to the colder morning but it never went away as it warmed up. Once it did warm up and was ready to drive it would act normal if I kept it under 3000 rpm and did not boost. Still would barly idle. As soon as I would go to WOT or add boost it would sputter, hesitate, and backfire some (very small backfire). I was watching my knock on my PFC and that was not reading above normal. Temp was fine. My cheesy auto meter air fuel meter used to show rich all the way across the map (very rich). Now I see it dip to lean and bounce back and forth when I add some boost or go WOT. I only did that once or twice and noticed what was going on. The car ran fine the day before and showed none of these issues. I am checking all my vac lines and electrical connections. Nothing is jumping out at me. Mods I have include a street ported motor, PFC w/ commander/ 1300cc secondary injectors w/ stock pri, walbro fuel pump, DP, full exhaust, non seq twin turbos, FMIC, and I think that should do it. I have also looked up the sympoms of failing 1300cc injectors and this could be the problem. Just checking with the experts to see what they think and to give me ideas where to look.

Sorry for the length and thanks for your help.

rynberg

OK guys, does anyone know what I'm about to say....

Check to make sure the vacuum line from your MAP sensor to the intake manifold is still attached at both ends and doesn't have a leak.

The MAP sensor is the little box above the master cylinder. There should be a vacuum line attached to the bottom that runs over to the intake manifold.

RotorJoe

Give me a moment and I will go and check that. I am at work right now and I have to sneek away to mess with the car.

Thanks, I will keep all of you updated.

RotorJoe

Yes the MAP vacuum line is still attached and has no leaks.

Next Please.

Railgun

Maybe the other end of the MAP sensor? It hooks right into the UIM. You should be able to trace it down and feel if it's still connected well.

Look at the voltages for the TPS and O2 as well.

skunks

try resetting your ecu, could be stuck in limp home mode

actually i dont know if powerfc has limp home mode but thsi is exactly what happened to my car a few weeks ago, i reset the stock ecu and its fine now

good luck

NorthwindHost

Why does everythong think Autometer is crap? I love mine. =)

Anyway, I would check your map as well. Althogh I don't know why it would make your car run lean something may have changed or you need your car dyno tuned. =)

paw140

It sounds to me like either your car is in limp mode, or one of your injectors is malfunctioning. I would lean towards the injector, just because I don't think limp mode affects idle quality.

I guess it could also be a problem in your ignition system.

rynberg

The PFC doesn't have a limp home mode.

RotorJoe

Well thanks for all your input. It helped. I find that the autometer is only really good at wot and even then you may miss a quick spike to lean. I like mine too, at least it told me something was not correct. I have just purchased my car and need rewire/clean up a lot of things. As I wass checking the vac lines and electrical connections, I found one wire coming off what I think is the ignitor for the ignition. A wire (not the spark plug wire, smaller electrical wire) was grounding out on the metal coolant line on the engine. I noticed that and wrapped it up. I then continued to check other things like plugs, spark vac, TPS and almost got to my double throttle and injectors before I thought to start the car and see if I changed any thing. When I did the car sank right into its normal idle and once it warmed up it was back to being dead rich. Drove it around and it was back to normal. Root cause was the igniton wire shorting out. This now bumps up all the task of re doing all my wiring in the ride due to the sloppy job of the person/shop before me. Thanks again for all you input. I didn't think the PFC could go into limp mode, thanks though. I was hoping that my injectors did not fail, would hate to be one of the ones with 1300cc injector failure on the forum. Turned out to be ignition thanks, I sooo glad its better.