99BlackMaxMS

iTrader: (85)

I am basically trying to figure out what my problem could be here, any help would be greatly appreciated. I have been having a hesitation/sputtering/bucking issue that has been consistent since I have gone boosted. It is not rpm or load dependent, as it happens at 1500rpms at 2% throttle and 5000rpms at WOT. And it is random, sometimes the car pulls fine but mostly it hesitates.

I've swapped 3 different MAFs that have been in working condition and fine on non-boosted cars. I never had a problem with my old MAF before going boosted either.

I'm currently running a V2 blower with a 3.25 pulley (10psi), a Cartech adjustable FMU and a Walbro 255lph fuel pump. I was AFC tuned on a dynojet when I was N/A and haven't gotten a chance to jump on the dyno to get numbers or find a better AFR (I'm running pretty rich).

I don't think its a fuel related issue, the spark plugs are one step colder NGK coppers gapped according to spec (they were replaced when I installed the supercharger) and the coils appear to be fine too.

Is it necessary to upgrade to a larger MAF (ie, Z32)? Has anyone else had these issues before?

Thanks guys,
Matt

maxgtr2000

iTrader: (29)

Coilpacks? Infamous on 99s.

ChrisMan287

iTrader: (34)

What makes you think it's the MAF? It doesn't sound like that's the issue.

My guess would be coilpacks. They can look fine, even test fine but can still be bad. Being that you have a '99, that's where I would start first.

99BlackMaxMS

iTrader: (85)

Well the rear 3 have been changed out (as I have an 00vi swap). I could always get the front three and try swapping them, as I have never had any issues in the 75k miles i've driven the car. They all were replaced by the original owner IIRC though.

ChrisMan287

iTrader: (34)

Have you pulled your plugs just to see what they look like? What are they gapped to?

99BlackMaxMS

iTrader: (85)

I have not, but they were gapped to .037 IIRC less than 5k miles ago (when the supercharger was installed).

036mtmax

iTrader: (11)

Is the car throwing a code ? 300 maybe.

99BlackMaxMS

iTrader: (85)

It did a long time ago, as it was misfiring very slightly and inconsistently. It went away and now the only code is a P0100 for the MAF, which won't go away.

ChrisMan287

iTrader: (34)

Hmm, Didn't know you were throwing the MAF code. Maybe it the harness/connector? Or a leak in the intake?

Stillen Maxima

iTrader: (50)

Im having the same exact issue. I belive 036mtmax is having a similiar issue as well; i put my money on my coil packs. They may look good but for sure one or two could be bad. Ive had MAF issues before and this does not feel the same. My car has been N/A, SC, turbo and now back to NA and between my last month of running it turbo and now that feeling is still there. So I know its not that MAF. Has to be the coilpacks. Replace them all is what I would advise. Check all your plugs too. Im going to throw on a new set of plugs and coils soon. Ive just been too busy at work to deal with it and havent had time.

99BlackMaxMS

iTrader: (85)

I am in the same boat as you, I just haven't had time between school and work to get a chance to pull the plugs/coils. Especially having a second car just makes me want to avoid the issue. I'll be swapping coils soon, I'll keep everyone posted.

036mtmax

iTrader: (11)

^^^ Just to let you know i just got a quote from importrp which is an org sponsor on here for all 6 OEM Hitachi coils for 415 shipped which is a good deal. I think im gonna man up and do it. Good luck man let us know how it pans out.

Stillen Maxima

iTrader: (50)

Hahaha I hear you. I drove my 2nd car for 2 weeks to avoid doing this crap. There is just not enough time to do everything that I want to do during the day.

99BlackMaxMS

iTrader: (85)

I couldn't agree more. I've let the car sit for a couple of weeks now.

Just wanted to update, I picked up 6 coilpacks at the junkyard today and plan on swapping them out and seeing if my issue gets any better within the next few days. Hopefully it'll do it.

99BlackMaxMS

iTrader: (85)

I got a chance to test the coilpacks individually today, turns out that cylinder #4 was the one causing the hesitation/stuttering and its been running great since. Thanks for the advice guys.

Quickywd01

iTrader: (16)

Happy endings are the best.