Performance Musings on my 1993 Supersprint

[Tony]

So, last Spring I rebuilt the dizzy with a Pertronix, eliminating the old skirt-style rotor, and did a basic refurb of the Weber 45DCOE's on my 1993 Supersprint engine.

Ran perfectly, not a cough, pop or hesitation from 0-6000 rpm.

As the Summer progressed the cough, pop and hesitation slowly returned.

I just replaced the rotor and inspected the old one.

A bit of rough surface, but no evidence of any real problems.

I really expected to see some problems in the dizzy, but nothing seemed severe.

The fuel filters were clean, spark plugs 2,3 showed a bit of richness, but other than that, nothing really stood out.

Haven't fired it up yet, carbs are on the bench and will be cleaned.

 

Any general thoughts about the gradual decrease in performance over 2000 miles last summer?

 

Want my Seven ready to roll when it's sunny and 30. Got to be ready.....

 

Tony

[coffee break]

Fuel pump?

Trash in the fuel?

Water in the fuel?

That's my SWAG, good luck. :banghead:

[The Stig]

I'd start by pulling out the Jets and check for debris, replace fuel filter and check fuel regulator. Could be plugs or leads or coil even.

 

Plenty to try.

[Davemk1]

I agree - pull all the jets and air correctors and give them a good spritz of carb cleaner. The holes are so small that typically you can't see build up of vanish or junk in there but so often the car will run better after the jets get sprayed clean.

 

dave

 

I'd start by pulling out the Jets and check for debris, replace fuel filter and check fuel regulator. Could be plugs or leads or coil even.

 

Plenty to try.

[xflow7]

If cleaning the jets doesn't get you there, I might suggest replacing the dizzy cap. Not quite the same symptoms, but my Supersprint was giving me trouble a couple of years ago with a top-end misfire. I stripped and cleaned the carbs, replaced plugs/leads/coil etc. Finally, I replaced the rotor and dizzy cap even though I couldn't see anything wrong and that seemed to sort it.