strange noise

[rb240det]

Well not too long after getting my car dynoed...it decided to act up once again. It started running like crap after I had the alignment checked and adjusted. On the way back from the local Tech school/shop...it started bucking and pulling like garbage when I would try to accelerate. After getting home and parking...it would idle badly, very similar to when I had a bad coilpack. I went ahead and checked all the coilpacks, did an ECU diagnostic and it was throwing the knock sensor code (34). I traced the wiring and check both of the knock sensor which did not appear to be in any state of replacement/repair. I cleared the ECU and cranked my car...only to have the same results. My SAFC isn't reading any kind of crazy knock at idle...but I did have really high counts when I tried to drive it. Now saying all of that...I noticed an odd tapping sounds coming from the intake mani. side of the motor, near the head. I dunno what to place it as...maybe trash found its way to a lifter? I'm trying to get this thing back on the road soon, but can't figure out what else the problem might be. Any one have any suggestions? I'd appreciate any help!

[Carl H]

proly the injectors man, i thought they were pretty noisy.the new ones i have in my car are obcenely noisy, even with the hood closed and 20 ft away you can still hear those bastards clicking away.check timing man, might be too advaced and its picking up knock.

[Yellow4g63]

CAS?

[foCk]

mabye the alignment shop took it out for some test runs and messed somethin up

[rb240det]

LOL...no I found out that the Mk III Supra injectors are a tad louder than the stockers. That was the loud clicking sound that I was hearing.

[NiTeRiDeR]

MAF?

[Wulfgang]

...it started bucking and pulling like garbage when I would try to accelerate...

This could be many things, but in most cases on this forum, it means your MAF wire is too long and/or not shielded properly.

[NiTeRiDeR]

Yeah, it could be anything from your MAF Wires, to a Fuel Filter, Spark Plugs... Coil Pack, Ignitor Coil, etc etc

So start with the cheapest/easiest things to troubleshoot and work your way up from there.

[rb240det]

Yeah, it could be anything from your MAF Wires, to a Fuel Filter, Spark Plugs... Coil Pack, Ignitor Coil, etc etc

So start with the cheapest/easiest things to troubleshoot and work your way up from there.

MAF wires are the same length as factory, fuel filter is practically new, spark plugs were replaced (then quickly fouled due to richness), coilpacks were all tested and turned out fine, and I just replaced the ignitor chip hoping that it was the source of my problems. It runs much better now, I have practically no problems...until right before it starts to hit boost. Now as I start to build boost, the car stutters and bucks (as previously mentioned). I checked the ECU time and time again and it keeps giving me the all-clear (55). So tomorrow I'm going to double check for any sort of boost leak, other than that I'm beginning to be stumped...any advice would be greatly heeded. Thanks!

[gawdzilla]

i had similar bucking/surging problems. turned out to be the MAF itself. they don't seem to like just dying, instead they start acting up and giving you those intermittent problems. see if you can get your hands on a buddy's MAF and try it out.

[rb240det]

i had similar bucking/surging problems. turned out to be the MAF itself. they don't seem to like just dying, instead they start acting up and giving you those intermittent problems. see if you can get your hands on a buddy's MAF and try it out.

Well we finally found the problem(s). You were (kinda) right about the MAF. It was leaking a little bit from around the seal at the top of it, so a little bit o' sealant took care of that. Still had some trouble hitting boost without the bucking problem. So we bought some PVC caps and some valve stems and pressurized the intercooler piping and found two random boost leaks. So after fixing those she's running like a dream now. I appreciate all the help you guys have given me! Thanks!