help??
Thread Starter
Heel & Toe
Joined: May 2006
Posts: 22
Likes: 0
From: windsor ontario
help??
need help 1989 auto. idles a little rough but with tranny in drive the engine will miss or shutter at 45 mph then in OD at 68mph it will do the same any suggestion would be appreciated.( new plugs wires cap )
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 41
From: Baltimore, MD USA
If your car has the original Multec fuel injectors (gray body color) unplug the injector connector and measure with an ohm meter the resistance across the coil windings.
Should be around 16 ohms. Do this when the engine is cold and with the engine hot. The injector coils on the Multec injectors used in 89 are cooled by the gasoline. Over time the some of the additives would eat away the insulation of the coils.
Should be around 16 ohms. Do this when the engine is cold and with the engine hot. The injector coils on the Multec injectors used in 89 are cooled by the gasoline. Over time the some of the additives would eat away the insulation of the coils.
Instructor
Joined: Jun 2006
Posts: 194
Likes: 0
From: Hartselle Al
Have you done a basic tune up.
If you haven’t done a basic tune up, (plugs, wires, cap, and rotor) then do that before you start playing around. Too many people look for problems when it’s just maintenance. How long ago, how many miles since you done this.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
Originally Posted by crumby2
need help 1989 auto. idles a little rough but with tranny in drive the engine will miss or shutter at 45 mph then in OD at 68mph it will do the same any suggestion would be appreciated.( new plugs wires cap )Is the Service Engine Soon light on?
Have you checked fuel pressure?
Does it idle rough when the engine is cold, hot, or both?
Are the spark plug wires routed correctly and to the right cylinder?
Are you sure you have spark at each cylinder?
Give us a little more info and it souldn't be hard to find the problem.
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Could it be a torque converter beginning to fail? Try disconnecting the plug on the pass side of the trans and take a test ride. Had something similar happen on a friends 84. It was the converter, in his case. Worth a look. Quick and easy to do.
