chewg

Yesterday, my engine was running very oddly. The best way to describe it is that it feels like it is skipping a beat during idle. When the car is moving (1990 C2 Manual) and accelerating, it has a mild judder and definitely is low on hp & torque. It did this during my morning drive to work (40 min drive).

On my drive home, I decided to drive more aggresively to see if I can clear the problem, and it did! It has been running smoothly since.

Is there a cause for concern? Or is it some old fuel/residue in the tank - I did run it to almost empty just prior to the problem appearing. Should I add some fuel injection cleaner to clean the injector heads? As usual, any help/guidance is much appreciated.

tobago Bob

I have had this happen on a low tank also. It could be water, maybe some alcohol would dry it out. I also find that techtron fuel additive is quite helpful.

Tobago Bob

springer3

If you suspect fuel contamination, replace the fuel filter. Cut the old one open (non sparking tools, of course), and inspect for water and dirt. Check the fuel pressure while you are spilling gas anyway.

I would find the cause of the problem if it does not clear up. You could be burning a valve, and it is better to do the valve job before the valve overheats and possibly damages the engine. A compression test is the next cheapest diagnostic after checking for bad gas. Next, get the hammer, and see what codes are active. I owned one for a while, and I was impressed that it never missed a diagnosis.

Good luck, and be sure to report back when you find the problem.

Christer

Check the distributor belt maybe...?

tobago Bob

Does anyone have a hammer for sale?

Tobago Bob

Indycam

ebay Item number: 8011405779

chewg

Thanks all for your insights. The problem did not re-appear after clearing itself. It's been going good for over 200 miles now (touch wood). Likely cause - running the car until almost virtually empty.

Happy Driving!

Luke

Bad coil possibly`