328 runs rough

my 89 328 is running rough or stumbling up to about 3000 rpm after 3000 rpm runs great anyone else experienced this problem ? what was it ?

 

Check your plug wires... Especially the boots that go over the plugs... I had that problem a few years ago....

 

I am going to go through all elec connects tommarow will also check plug wires,it did this to me once last year but it cleared up untill last week

 

When my ignition module was going bad on the rear bank...the syptoms began first at the lower RPMs. Soon thereafter, the rough running was throughout the RPM spectrum. A timing light on either bank will ID if it is confined to one bank or another or more of a systemic problem.

 

This can happen when a plug extender is going bad. Sometimes you get a completely dead hole, sometimes it just runs bad at low RPM. First thing to check, especially if you recently got water on your motor.

Dave

 

Yup, it is usually ignition related. I would start with what was mentioned first, extenders and wires. If water got down one of the plug holes, that can start a miss too. And usually, only replacing the plug will fix it. Then you need to replace the plug well cap, to ensure water doesn't get down it again. You can tell if they get wet, the plug will probably be a bit rusty on the outside. I had this problem on my 308. New plug well caps from T.Rutlands fixed it up. Never had a problem on my 328, as they had a better sealing system, of course the ones on my 308 where over 23 years old!!

Let us know what you find.

 

called taylor today they are going to match the wires to a part # that will work on the 328 will know the part number tommarow ill get a set in and install hopefully thats it didnt get to work on it this weekend

 

Inspect the extenders, they seem to be the culprit as often as the wires.

 

+ 1. Sometimes the plug extenders can look completely normal and still be bad. I got a set like that from one of the more popular supplier of parts.

 

I have been thinking about these wires and am going to elimenate the extenders and use the taylor 8 mm streight boot wires with plug wire plyers they should go on ok . I am sending taylor one of the old wires for them to match up to a more stock plug boot to ease install i will see this weekend how hard it is to install the wires

 

you going to leave the plug wells open?

if the entire taylor straight boot will fit in the well with enough space for the oem boot to go on top, then the only trick is getting the 8mm wire through the oem boot.

I used a piece of tubing that I managed to drill out just large enough for the 8mm wire to slide into, and still retain enough wall thickness to not bend. Clamped that in a vise and used a bit of lube on it, then it was possible to force the oem boot over the tube - essentially, you have to straighten the 90 degree bend inside the boot. Once the oem boot is over the tube, you can just thread the taylor wire through and then pull off the oem boot along with the wire.

I ws just attaching ends to the taylor wires and then working them back into the oem boot, but it'd also work for what you need, though you'd need to put the boot over the tube in the other direction.
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the tubing trick worked great I made up both harness last night the plug ends are not to hatefull to get on to the plugs the 8mm wire is easy to work with one of the caps was tighter on the wires a little wd 40 did the trick.the problem was a burnt plug extender and a wire end.