Shudder while ideling
Thread Starter
Racer
Joined: May 2011
Posts: 346
Likes: 3
Shudder while ideling
I have an 02 with 58k on its mostly original. Last week I took it for a long drive and at one point I was coming up a ramp at low load and it developed a shudder. I gave it more throttle and it was fine. Drove it to Canfield,Oh and back and when I got home it started to shake badly, motor related, periodically when sitting at idle in drive. No check engine lights and no codes that relate to this in the computer.
It has the original plugs and wires so I plan to start there. I got GM red wires and NGK iridium IX plugs. Any chance it could be the TPS? Any other ideas?
It has the original plugs and wires so I plan to start there. I got GM red wires and NGK iridium IX plugs. Any chance it could be the TPS? Any other ideas?
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
Dirty Mass Air Flow sensor could cause rough idling.
Last edited by JR-01; Sep 30, 2017 at 09:34 PM.
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Thread Starter
Racer
Joined: May 2011
Posts: 346
Likes: 3
Man I hope it's not a valve spring, I have a non z06 and I was told they didn't have the valvesping issues.
If it was a valve spring wouldn't it happen all the time? This is only at idle if I'm WOT it runs like a champ
If it was a valve spring wouldn't it happen all the time? This is only at idle if I'm WOT it runs like a champ
Le Mans Master
Joined: Nov 2006
Posts: 7,021
Likes: 46
From: enterprise al
St. Jude Donor '08
Doesn’t sound at all like a valve spring issue to me.. I had a slight misfire recently and it turned out to be a couple bad plugs (were not original, I installed them 5 yrs ago or so, with the high performance red wires), and a faulty IAT sensor
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
Yes. There are a variety of things that can cause rough idle. Best to address the cheapest things to fix first. Would kinda suck to replace a bunch of parts only to find out it was a batch of bad gas, vacuum leak or dirty thottle body or MAF sensor.
Last edited by JR-01; Oct 1, 2017 at 10:18 AM.
Thread Starter
Racer
Joined: May 2011
Posts: 346
Likes: 3
So I pulled the airfilter, cleaned the MAF sensor and cleaned the TB. The airfilter was isnane!! It was so clogged it actually had hard corn kernels in it. MAF wasn't to bad and neither was the TB.
Sadly the miss is still there, I'm convinced its plugs and wires but I could be wrong. Gonna try and do them tomorrow.
At least I got the nasty airfilter out, I wanted to post a picture but Photobucket sucks now
Sadly the miss is still there, I'm convinced its plugs and wires but I could be wrong. Gonna try and do them tomorrow.
At least I got the nasty airfilter out, I wanted to post a picture but Photobucket sucks now
Last edited by pghjeeper; Oct 1, 2017 at 07:10 PM.
Le Mans Master
Joined: Sep 2013
Posts: 8,900
Likes: 1,074
From: Wisconsin
So I pulled the airfilter, cleaned the MAF sensor and cleaned the TB. The airfilter was isnane!! It was so clogged it actually had hard corn kernels in it. MAF wasn't to bad and neither was the TB.
Sadly the miss is still there, I'm convinced its plugs and wires but I could be wrong. Gonna try and do them tomorrow.
At least I got the nasty airfilter out, I wanted to post a picture but Photobucket sucks now
Sadly the miss is still there, I'm convinced its plugs and wires but I could be wrong. Gonna try and do them tomorrow.
At least I got the nasty airfilter out, I wanted to post a picture but Photobucket sucks now