just got done with my rebuild and single turbo swap and having a couple of problems. My car at past 1/4th throttle will buck real bad and hesitate. i do not have the intake air thermosensor hooked up, because it was cut off on the previous wiring harness and I will put that back together. i was wondering if that could be the cause? i also hear a vacuum leak, but can't tell where it could be coming from, i've checked about every place there could be one. My car also catches boost up to around 7 psi, but doesn't run right. Anyone with any ideas? The pfc is also tuned for the single turbo and 1300 secondaries.

 

it might be the cause of it.. but i don't think its the intake temp. one of my fd, the intake temp doesn't work correctly (sometimes reads -30C on PFC) and it back fires and boggs a little.. but it does do what your talking about. I did have some issues with someone else's car and it was due to crank angle sensor.. My suggestion would be to make sure everything is plugged in correctly and all your check valves and vac lines are in order..

 

I'm having this exact same problem, and have been working on it for about a week now. Wiggling the plug to my TPS seemed to take away all issues with vacuum running. If you are able to build 7 lbs of boost, but no more then I'd check the restrictor pills on your wastegate, make sure they are still there. The wastegate spring is held to 7lbs, so if its just an empty vacuum line going to it, it'll vent at 7lbs. I do have my AIT hooked up, but without a pfs I have no way to read it. I'm starting to consider my crank angle sensor. I can accelerate fine if I stay under 1/4 throttle, nice smooth revving. But as soon as I crank it, it'll stumble to the point of not even revving anymore. UNLESS I'm above 4500 rpm. At that point it acts normally, minus some boost (due to my manual boost controller not being dialed in as I put it in trying to find this problem). Stay updated on what you find ... you answer could help somebody else ;-)

 

Alright guys...I hooked up the IAT and fixed a vacuum leak on the UIM and didn't make much difference. It seems like hit hits around 4100 rpm's and cuts out. The secondary injectors are hooked up also. Any other ideas what it could be?

 

Replace your spark plugs, worked wonders for me. (the ones i had were 1.5k miles old)

 

SEVERE ground problem? sounds like something not right with injectors/pfc.

 

sounds electronic to me. Did you install the engine and turbo kit yourself?

 

Yeah Its a Landers rebuild and installed it myself. Where did everyone ground the main ground that is on the car harness on the drivers side of the engine bay? Could that be my problem or would my car even start? where else could it be?

 

Grounding could definitely be the problem..

You could go straight from negative terminal of the battery to the engine.

 

be careful...

That grounds from the side of the engine to the firewall

 

I ahve my battery relocated to the bin behind drivers seat,, where else could i put it? engine or side of the car

 

I believe the spot that I did it was right infront of the bins underneath the carpet. There's a threaded bolt hole there. Sand the paint off until you see metal

 

no that one... I talkin about the other ground thats on the car harness

 

I would ground it to multiple places. Get a small stereo distributor and ground it to different location.. How big of a wire did you use to ground it??

 

reading comprehension anyone

 

LOL! You're correct.
He might want to get thicker wire from the firewall to the engine.

 

I honestly think the car needs tuning but checking grounding first IS easier

 

now u did use a battery relocation kit right?

your gauge wire MUST be 2 gauge OR LESS.

radio amplifier wire is usually 4 gauge and will not work

also u sanded down the paint on the ground area for the battery right?

also in the egine the grounding points are sanded down too? not bolted to paint right?

but have someone check your pfc that knows what they are doing.

 

My car starts and did before when i had the battery relocation kit..now it seems like it runs better when cold, but when it warms up its alot worse. i grounded the ground on the car harness to the powesteering and still no difference

 

I switched the Leading spark plug wires and didn't make any difference good or bad? Does that mean bad wire?

 

The leading spark plug wires are both hooked to the same leading coil which only has one connector going to it. Therefore they get the same signal and should fire at the same exact time. I would put them back the correct way L1 goes to the lower front rotor L2 to the lower rear. If you were to have the wires switched that would cause a big problem and so would having the connectors at the coils switched.

 

I think you should have your car looked at by a tuner. The pfc may be tuned for an engine with a different port than yours

anyone good in the area?
I wouldn't be getting into boost in case that is a lean spot you're feeling. Who did you get the pfc from any way? What was their engine like compared to yours and what primaries were they running?

 

Same primaries as mine (550's) and his motor was ported, but a little smaller than mine.. My car is running really rich, I don't think im hitting lean spots. But I'll get it to someone with a dataloggit and see what they say. Thanks

 

Didn't get a hold of the guy, when my car hesistates when i go around 4k rpms or over half throttle it black smokes alot...any clue?

 

The transition between the primaries and secondaries needs to be tuned out