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hesitation in OD under boost
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VTSS
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PostPosted: Sat Mar 03, 2012 11:21 pm    Post subject:  hesitation in OD under boost Reply with quote

Recently fixed an exhaust leak at the upper downpipe gasket. Now the car seems to sputter/hesitate when it hits boost in overdrive. It seems like a misfire, I checked all the of spark plugs and wires and they are fine - replaced less than 1000 miles ago.

Any ideas?
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IffyG
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PostPosted: Sun Mar 04, 2012 12:11 am    Post subject:   Reply with quote

What did you use for the plug and wires (specifically, the brand)? Ever cleaned your MAF? I was chasing down a misfire for a long ass time that turned out to be a MAF that was on it's way out .

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VTSS
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PostPosted: Sun Mar 04, 2012 12:43 am    Post subject:   Reply with quote

Autolite 103 plugs, ZZP gen 3 plug wires. What is the best way to clean the MAF? I am going to pick up a fuel filter tomorrow and change that, I dont think it has ever been done before and the car is almost at 100k.
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Frank
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PostPosted: Sun Mar 04, 2012 3:15 pm    Post subject:   Reply with quote

Definitely change the fuel filter and the air filter...as far as the MAF goes, you can specifically buy MAF cleaner, or just use electrical contact cleaner. Just don't put it spray it at full blast from close up because you could damage the wire.

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VTSS
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PostPosted: Mon Mar 05, 2012 12:01 am    Post subject:   Reply with quote

Fuel filter changed, cleaned the MAF, added some dry gas...still having the same problem. A few weeks back I had attempted to pull the engine, after running out of time I decided to put everything back until I could get more time off from work. That is when I noticed the exhaust leak. For all I know the hesitation problem has been there since the attempted engine pull and because of the exhaust leak I never got into boost due to the obnoxious leak noise.

Could it be an engine ground problem? I had a misfire once and the CEL came on almost immediately because the #6 spark plug wire had melted to the rear manifold. What else should I check?

I also noticed today that it does it outside of OD too, seems like whenever boost goes above 3psi. I do have a datalogger, is there anything I can log that would help pinpoint the issue?

Edit: Just found this, oddly the same plugs I am running.. http://www.3800pro.com/forum/i.....boost.html
I put the 103 plugs in when I attempted the engine pull
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PostPosted: Mon Mar 05, 2012 12:23 am    Post subject:   Reply with quote

Could be the zzp wires. I bought some of the gen 3 wires from zzp for black friday last year and my car would be fine cruising around but misfire badly when i would put my foot into it. ZZP wires were in good condition but I changed back to stock wires and it was fine.
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PostPosted: Mon Mar 05, 2012 12:27 am    Post subject:   Reply with quote

I agree with Scotty - From what I've read on these forums, I will never use anything but ACDelco ignition products - coils, wires

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PostPosted: Mon Mar 05, 2012 12:30 am    Post subject:   Reply with quote

Scotty455 wrote:
Could be the zzp wires. I bought some of the gen 3 wires from zzp for black friday last year and my car would be fine cruising around but misfire badly when i would put my foot into it. ZZP wires were in good condition but I changed back to stock wires and it was fine.


Getting the ZZP wires off the car is the first thing I'd do to troubleshoot. They haven't had a great track record in the W-body community. Search over on GPForums and you'll see tons of people get rid of ZZP wires because of misfires.

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PostPosted: Mon Mar 05, 2012 12:30 am    Post subject:   Reply with quote

Well after doing some research I think I am using way too cold spark plugs.

"- Use AutoLite 103's (three heat ranges colder) if your car is similarily modded like this: has a 3.0 supercharger pulley, 1.90:1 rocker arms or aggressive cam, CAI setup, lower-temp thermostat, exhaust headers, cat-back exhaust system, port and polished supercharger housing and/or throttle body, and reprogrammed PCM."

I have a plog, catback and CAI. Nothing else. I wish ZZP explained this a little better, found that on 3800performance.

I held onto the wires I had on the car before I got the ZZP wires. Basic wires from Car Quest auto parts. I will swap them out tomorrow and see what happens.


Last edited by VTSS on Mon Mar 05, 2012 12:32 am; edited 1 time in total
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PostPosted: Mon Mar 05, 2012 12:31 am    Post subject:   Reply with quote

billy101 wrote:
I agree with Scotty - From what I've read on these forums, I will never use anything but ACDelco ignition products - coils, wires


PRJ Wires are a fantastic solution if you want thicker wires. I've had mine on for 2+ years with no issues at all.

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PostPosted: Mon Mar 05, 2012 12:33 am    Post subject:   Reply with quote

VTSS wrote:
A few weeks back I had attempted to pull the engine


Why?

Quote:
I do have a datalogger, is there anything I can log that would help pinpoint the issue?


MPH
RPM
TPS %
MAF Hz
Misfire on each cylinder
MAP kPa
LTFT
Bank 1 O2 mV
Current Gear
IAC count
Timing
KR
Coolant Temp

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PostPosted: Mon Mar 05, 2012 12:34 am    Post subject:   Reply with quote

Plugs are most likely too cold for ya but I would get rid of those wires if i were you
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PostPosted: Mon Mar 05, 2012 12:34 am    Post subject:   Reply with quote

VTSS wrote:

I have a plog, catback and CAI. Nothing else. I wish ZZP explained this a little better, found that on 3800performance.

I held onto the wires I had on the car before I got the ZZP wires. Basic wires from Car Quest auto parts. I will swap them out tomorrow and see what happens.


I'm not too familiar with using colder plugs (I'm N/A and won't be upgrading anytime soon), but I think you be OK with stock plugs.

The basic wires from Carquest aren't going to be of much use either. These cars are super finicky with ignition parts. PRJ or AC Delco are pretty much the only brands of wires with a good track record.

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PostPosted: Mon Mar 05, 2012 12:39 am    Post subject:   Reply with quote

Thanks for the input everyone. I will be picking up some new plugs tomorrow, might as well start from scratch. I had used the car quest wires for 15k+ miles without any problems so I will go back to those until I get a better set.
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PostPosted: Mon Mar 05, 2012 12:44 am    Post subject:   Reply with quote

If they worked before, they are a much better choice than the ZZP wires. I say you can probably get away with them until you develop a misfire in the future.

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