Engine surging
Engine surging
Help Help 90 GTA 350 tune port it is surging at idle and surging down the highway have replaced computer new distributor took tune port system off checked for intake leak cannot find anything wrong it sounds like it has a vaccum leak but cannot find one have checked fuel pressure and injectors HELP HELP.
Thanks
Thanks
Member
Joined: Nov 2002
Posts: 149
Likes: 0
From: Ft Worth, TX
Car: 91 Z28 with 64,000 miles
Engine: 350 TPI
Transmission: 700R4
Re: Engine surging
It may be a vacuum leak in one of your accessories. Disconnect all the vacuum lines form the plenum (except sensors) and block them off. If it's a vacuum leak it should steady out. then reconnect one at a time to find which line has the vacuum leak. The hard plastic lines are natorious for cracking and being difficult to find. Make sure to check the brake booster hose from the plenum also.
Joined: Dec 2005
Posts: 4,795
Likes: 15
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Engine surging
It may be a vacuum leak in one of your accessories. Disconnect all the vacuum lines form the plenum (except sensors) and block them off. If it's a vacuum leak it should steady out. then reconnect one at a time to find which line has the vacuum leak. The hard plastic lines are natorious for cracking and being difficult to find. Make sure to check the brake booster hose from the plenum also.
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