Hesitation during acceleration
Burning Brakes
Joined: Nov 2008
Posts: 995
Likes: 1
From: Naples Campania
My '94 tended to bog when accelerating uphill when the engine was hot. I pulled the EGR valve which was crudded almost solid, cleaned it out and the problem was gone. Can't say if that was the cause or not, maybe just coincidence. I also put in a manual fan switch to keep temps down, so that may have been a factor, too.
Anyway, it's good now. Best of luck.
Anyway, it's good now. Best of luck.
Just FYI, it pulls exhaust gas into the intake manifold and helps ionize the fuel/air mixture.
Instructor
Joined: Dec 2009
Posts: 189
Likes: 0
From: New Jersey
I'd also pull the MAF sensor and spray it with some MAF cleaner, my 94 had a low rpm hesitation/off idle stumble and it turned out to be the MAF. Cleaning mine didn't help I had to replace it but it cured my problem, a can of MAF cleaner is cheap and worth a shot and with 100k+ miles probably should be done anyway 
My problem was intermittent but occurred 90% of the time while the motor was cold also
My problem was intermittent but occurred 90% of the time while the motor was cold also
Last edited by RustInPeace; Sep 21, 2011 at 09:38 PM.
Instructor
Joined: Sep 2004
Posts: 166
Likes: 1
hesitation blogging stumbling
Hi everyone I just read a couple of your posts
You are having some of the same problems that I have been through over the past 2 years I would recommend that you read some of the treads I have the members on here are responsible for helping me with everything I must say I wouldnt still have the car if it wasnt for them.
If there is any thing I can help you with please feel free to contact me
You are having some of the same problems that I have been through over the past 2 years I would recommend that you read some of the treads I have the members on here are responsible for helping me with everything I must say I wouldnt still have the car if it wasnt for them.
If there is any thing I can help you with please feel free to contact me
Thread Starter
Instructor
Joined: Jun 2011
Posts: 205
Likes: 3
From: Great Mills Maryland
Thanks for the replies. I need to check all the possible causes mentioned. Now the I got my Olds 455 finished, and can move the 442, I can put the vette in the garage and check it out.
This is a vid of the Olds running for anyone interested. My vette is in the video also.
http://www.youtube.com/watch?v=Mc2I4MJiWbo
This is a vid of the Olds running for anyone interested. My vette is in the video also.
http://www.youtube.com/watch?v=Mc2I4MJiWbo
Last edited by 67Olds442x2; Sep 23, 2011 at 07:49 AM.
Burning Brakes
Joined: Aug 2010
Posts: 951
Likes: 3
From: Placerville CA
I'd also pull the MAF sensor and spray it with some MAF cleaner, my 94 had a low rpm hesitation/off idle stumble and it turned out to be the MAF. Cleaning mine didn't help I had to replace it but it cured my problem, a can of MAF cleaner is cheap and worth a shot and with 100k+ miles probably should be done anyway
I have heard that running a K&N oiled air filter will increase the rate of MAF problems as oil mist collects on the wire and attracts crud.
