Funny Bumping under load 82
Thread Starter
Burning Brakes
Joined: Jan 2006
Posts: 1,154
Likes: 1
From: St Augustine FL
Funny Bumping under load 82
My 82 has a funny bumping under slight load around 1700-2000 RPM at around 25 to 30 MPH. What would cause this? The car shakes a littel and acts like it is have a hard time delivering the appropriate power to the rear wheels. The engine seems like it wants to stall but doesn't. If I give the car more gas and get the RPMs up it settles down quite a bit. I am stumped.
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Originally Posted by bluesilver82
My 82 has a funny bumping under slight load around 1700-2000 RPM at around 25 to 30 MPH. What would cause this? The car shakes a littel and acts like it is have a hard time delivering the appropriate power to the rear wheels. The engine seems like it wants to stall but doesn't. If I give the car more gas and get the RPMs up it settles down quite a bit. I am stumped.
If it is...Easy check.
Engine running push up on underside of EGR. No change? Clear passages or replace valve.
RPM drops? Have someone increase RPM to 1200 and let it return to idle. If you can feel movement on the underside of the EGR system is fine. No Movement? Unplug the hose from the EGR...run to 1000 rpm...if you have over 3 inches of vaccum EGR valve is bad...if you have under 3 inches of vaccum its either the EGR solenoid or the connection to the front TBI. You need plus 3 inches of vaccum to move it.
Jim
Drifting
Joined: May 2004
Posts: 1,442
Likes: 2
From: Flanders NJ
It's your convertor locking up. I got a plug in pigtail that plugs into the transmission and the existing wiring plugs into the new pigtail and this will only allow lock-up when you are in Drive. Around town you can keep it in 3rd and it will not lock-up. When on the highway put in D and it will lock-up in overdrive for better milage. Works great. I can't rememmber where I got it but it was one of the major suppliers, Ecklers, Mid-America, ? not sure where, you need to hunt around.
Dave
Dave
