I live in San Jose, just converted to single and Im having problems need someone who knows a bit more than me to help diagnose and brainstorm possible problems with me. Has a bad idle, when under load( driving conitions wont pass 3k RPM in first, 2k RPM in Second. Idle surges. Sounds like a brige ported motor Brap Brap Brap but its stock motor w/~ 25k. Any help will be greatly apprecaited. Thanks

Chris

 

i guessing its an fd? and what kind of turbo? what kind of engine management do you have? power fc? safc2? emanage? what kind of injectors do you have? what aftermarket peices do you have? intake? exhaust? first of many..not a guru persay but you know..

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K so here is everything. FD Stock motor with ~25k just tore it down about a month ago and it was driving perfect. HKS Tubular manifold, Tial 46mm waistgate, Garret GT35r, 255 walboro fuel pump, aeromotive fuel filter, SS -6 lines, 550/1300 injectors. Sard FPR, MSD wires, HKS twin power, Power FC. Full 3 inch exhaust.

 

So what im thinking is maybe an injector or fuel issue? I havent changed anything with the spark same wires same coils same HKS twin power so Im thinking that is safe. I just put in the fuel filter but I have proper fuel pressure at start up. Vacuum is so simple now I dont think there is any way that could be messed up. Please any ideas would bve great.

 

hmmm....damn, is all the tubing good? prolly have to get it tuned..i mean it starts witch is good, but the power fc was tuned for the twins not the single..the injectors are more then adaquate for the setup..be careful you might be runnin to lean and you could throw a seal..also did you leave the sensor on the upper intake mani unpluged? its the one in the middle..it could be interfering with the pfc. theres my idea..

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I downloaded a MAp from a car that has almost identicle mods. The piping is pretty simple and its all t-bolt clamps. As far as the sensor if your refering to the intake temp sensor it is plugged in. Thanks for your input I apprecaite you taking the time to post up your ideas.

Chris

 

hey no problem, hell if you were near by i would drop by with some brews and help you figure out the problem..well if i come up with anything ill post..good luck with the deal..i dont think its the air intake temp sensor, damn, or is it?

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running too rich

 

i thought that as well, but i went with too lean..go figure.

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brap brap brap idle= rich

surging idle = lean

 

Do I have a bad injector or do you think it is just tuning? Could anything I did to the wiring harness casue the injectors to stay on longer or mess with that aspect. Thanks.

Chris

 

what did you to the harness? cant be bad injector when did you get them? its got to be tuning..being that your running rich it might just have to be leaned out a bit..


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I cut all the solenoids off and connected the wires kinda like jumping them them wrapped it all back up. How do you lean it out with a commander?

Chris

 

why on earth would you do that? i guessing that the emissions are removed? theres only some silenoids that you have to jump..the one for the check engine light and some other on that i cant list or remember, even then you have to use resistors for them not just straight over..its tuning, get it retuned and you will be fine. you might want to invest in one of the steve kahn sessions..

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either tuning or the fuel pump relay might be stuck on high, OR something with the injectors, leaking, wrong ones, sticking open, etc..

 

I have another set of injectors I am going to put in tomorrow. It sounds horrible and wont drive if its just tuning Im not worried I am getting it tunned in Sept by steve I just want to make sure its not anything else. it starts fine, at idle it almost sounds like its has a mis, or running on one rotor. spark is all there, fuel pressure is good, vacuum is correct. Thanks for your input guys. another question is I have stock primaries if I was to reset the PFC to the stock base map shouldnt that help my idle problem idle is idle right? And should I just cut the connection from the wires i jumped?

Chris

 

if its running on what you did to the silinoids then i wouldent worry about it, eventually your going to have to do it right to prevent any kind of damage..but other then that you'll be alright..as far as the reset to base map on the pfc i dont see why not but i would set the rev limiter to like 4 grand tho..just to be safe, you dont want it leaning out up top and you popping the motor before steve can get to it..

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Your Spark Plugs Might Be Fouled! Check Them! Du Ma!

 

that would be a good idea..but its still going to need tuning..

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uhhh yea


Since the engine is running under 3k RPM, check your secondary plugs first.

 

secondary plugs..eh?

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Why would I check the secondaries first under 3k? Thought they dont come on untill higher RPM?

 

Whatever, I've been out of the rotary game YEARS AGO! Better than checking the pipping right? haha


Exactly, if your leadings work under 3k, wouldnt it make sense to check the trailing (after 3k)?