Help Please Descreened MAF
Thread Starter
Staging Lane
Joined: Jul 2003
Posts: 88
Likes: 0
From: San Antonio
Help Please Descreened MAF I descreened my MAF a few months ago, it ran good no problems. Now when I punch it at around 80-90 mph it feels like it gasp for air like (Lag) or something, Check engine light comes on and also I hear I guess it would be KR. Should I buy a gm new MAF for 151.00 (GM supplier Disc) or spend a few more dollars and get a 85mm MAF or ???
Please help!!!
Please help!!!
Administrator
Joined: Jan 2002
Posts: 45,841
Likes: 5
From: Earth
Re: Help Please Descreened MAF Does it sound like someone's shaking a coffee can full of bb's? If so, you're definitely pinging. I doubt that is the direct result of removing the MAF screen. My Z28 used to ping. I switched from Sunoco 94 octane to Amoco 93 octane. No more pinging. Weird, but true. Lots of LS1's have this problem.
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
Re: Help Please Descreened MAF
could I try Oct. booster?
Administrator
Joined: Jan 2002
Posts: 45,841
Likes: 5
From: Earth
Re: Help Please Descreened MAF Let me guess, it only happens above 5,000rpms right? horist might be right. You could be running a tad bit lean. The temperature plays a big role too as well as the fuel you run. Don't run octane boost. It's junk.
Re: Help Please Descreened MAF Shine a light into the MAF and check and make sure none of the wires in the MAF are broken. There are five very thin wires. With ill fitting lid sometimes a bug or something can get in and break a wire. Also if you just cleaned your air Holley air filter check for oil on the wires. That can cause strange things too.
Re: Help Please Descreened MAF
Shine a light into the MAF and check and make sure none of the wires in the MAF are broken. There are five very thin wires. With ill fitting lid sometimes a bug or something can get in and break a wire. Also if you just cleaned your air Holley air filter check for oil on the wires. That can cause strange things too.
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Staging Lane
Joined: Jul 2003
Posts: 88
Likes: 0
From: San Antonio
Re: Help Please Descreened MAF Yes, I burn oil about 1qt every 3k miles. Yes, it starts to ping around high 4k rpm to passed 5k rpm, I really never paid attention to that because I dont know what to look for. I cleaned my filter a few weeks ago, didnt see anything like oil, but I did not check the MAF but I will this weekend.
11 Second Club
iTrader: (20)
Joined: Sep 2002
Posts: 2,684
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From: Albuquerque NM - The Land of 8000ft DA
Re: Help Please Descreened MAF 2002SS339
It sounds like the same problem a friend is having. He has an 02 Z. He also has autotap and said he was getting knock in the upper RPMs.
He also mentioned his car consumed a lot of oil.
We decided to do the "PVC" mod to see if it would alleviate the problem.
goto
www.installuniversity.com
www.ls1info.com
www.slowls1.com/pcv.htm
you'll see writeups on what I am refering to.
Your not going to find oil on the filter or on the MAF, the oil gets introduced from the PVC behind the throttle body. You need to remove the throttle body and run your finger on the inside of the intake. Your finger will more than likely have oil on it.
The oil being consumed lowers the octane level of the fuel and can be attributed to knock.
Hope this helps.
Frank
It sounds like the same problem a friend is having. He has an 02 Z. He also has autotap and said he was getting knock in the upper RPMs.
He also mentioned his car consumed a lot of oil.
We decided to do the "PVC" mod to see if it would alleviate the problem.
goto
www.installuniversity.com
www.ls1info.com
www.slowls1.com/pcv.htm
you'll see writeups on what I am refering to.
Your not going to find oil on the filter or on the MAF, the oil gets introduced from the PVC behind the throttle body. You need to remove the throttle body and run your finger on the inside of the intake. Your finger will more than likely have oil on it.
The oil being consumed lowers the octane level of the fuel and can be attributed to knock.
Hope this helps.
Frank
Re: Help Please Descreened MAF
Shine a light into the MAF and check and make sure none of the wires in the MAF are broken. There are five very thin wires. With ill fitting lid sometimes a bug or something can get in and break a wire. Also if you just cleaned your air Holley air filter check for oil on the wires. That can cause strange things too.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Help Please Descreened MAF [logic]He said his CHECK ENGINE light comes on...and the question is...WHY? That would be the first thing I would find out. Fix whatever's causing the DTC and you might return your performance.[/logic]
BTW, running a little lean will not cause a check engine light.
BTW, running a little lean will not cause a check engine light.
