awilli6

Ok, new coils and coil wires, new engine ground strap and no change. I got a stethoscope and heard a clicking in each injector. I now have to find a working timing light to test spark. Can I just pull the spark plug wire off one at a time to see if a change occurs? I don’t want to get shocked.

awilli6

Which computer would most probably lead to the issues I’m having. Both have been changed for rebuilt units in the las 2 years.

Mrmerlin

use a timing light .
NOTE the warning sticker on the top of the radiator warning against testing the ignition system due to hi voltage,
this can ill you

awilli6

Waiting on the timing light I ordered. I have Ken’s chip in the car. Is it possible something happened to it when I hit the pothole? Would that cause the symptoms I’m having?

Mrmerlin

well you could inspect this chip and or swap in the original

awilli6

Checked the spark with a timing light. All cylinders are firing. I guess I have to re-check the injectors again. I’m still open to any other recommendations.

FredR

Did you carry out the continuity test I suggested earlier between the two pins on the LH plug that carry the firing signal to each and injector?
The two LH pins in question feed the injectors on each bank and bifurcate in the loom as in 1 to 2 to 4 so if there is a break in the loom it could take out up to 4 cylinders. As I recall I seem to remember you saying that one side responded to testing and one did not. The side that showed no change would be the suspect bank

Kevin in Atlanta

I read your first post. And you had an existing problem which was a shudder once the car warmed up. I think that issue and the issue after hitting a pothole are related. If it has not been suggested before, I would wiggle the injection harness as close you can get to the firewall and then work your way up to where it should be secured to the back of the passenger side head. I'd look at the grounds at the back of the engine too.

awilli6

Im afraid that is above my skill set. I’m pretty good at bolt on repairs and horrible at diagnostic and electrical issues.

awilli6

Thanks Kevin. I’ll give that a try tomorrow.

FredR

Ash,

Most of us struggle to understand the wiring diagrams comprehensively but continuity testing is really straight forward and well within your capabilities I would think. Even so the alternative is to get yourself a noid light or two and use that to tell whether the injectors are firing or not as the case may be.

awilli6

I used the Noid light and all injectors are firing. I checked all ground connections and the passenger side coil ground wire was connected to the engine lift bolt. That was a little loose. While trying to tighten, the bolt that hold the engine lift bracket snapped.

question: does the coil ground wire have to be grounded to the engine? I connected it to one of the passenger side fender bolts but I still have the same running issues.

Kevin in Atlanta

Well, if the noid thinks all the injectors are firing then we have to look at spark plug leads. Have you looked inside the coil to see whether there any corrosion in there? Sorry if that question has already been asked.

awilli6

I checked each one and no corrosion. The wires are about 2 yrs old. The coils and coil wires are new.

awilli6

Does it matter where the ground wire is attached?