Hei.
The story:
Was driving around town with nicely warm engine (90 degrees). Stopped and picked up my girlfriend - we were chatting outside the car while it idled. Then it stopped and never started again.
The engine jumped back and forth and backfired through the SPi-module. The engine is the 1108 cc and is sitting in an Uno from 1993. It never started when cold either.
I suspected the ignition / vacuum advance and got a scrapyard spare. No progression. The vacuum on my last distributor was not working, but the engine ran anyway.
So today:
I bought a compression tester to check each cylinder. I refer to cylinder 1 as the leftmost when looking down into the engine bay (is that correct?). Well - tested for spark against top, and it was fine. Backfire through intake and no start. Compression shows 12 bar.
Next cylinder. Same procedure. Compression shows 9,5-10 bar. A little lesser.
Next cylinder - number 3 from left. There is a spark here as well, but with the plug removed the engine starts [:0][:0][:0]. It's running smoothly on 3 cylinders, not jumping like hell as when it stopped earlier. No backfire.
The 4th cylinder is a copy of the 3rd. The same happens. Runs fine on 3 cylinders. What's interresting is that these two cylinders show the same compression: 8, but it falls slowly to 4 when the engine idles (still in 3 cylinders).
So - I packed all plugs in and started. B) NOT. Backfire and not a start at all.
Are these two cylinders sharing the pressure?
Why backfire when one of the plugs on cylinder 3 or 4 are out?
Is it the HEADGASKET? [xx(] Between two cylinders[?]
There is no milkshake in the oil filler, the camshaft and vents look fine. No water loss. No oil in water. New plugs, HT leads, oil, etc. one month ago before the MOT.
I'M IN THE DARK HERE! Please help
Morten.
gas lowered on abarth wheels. upgraded interior and visuals. audio through phoenix gold and BLOWN kenwood.
projects: air in and out.
Honey that ain't no pistol - that's my LOVE GUN.
The story:
Was driving around town with nicely warm engine (90 degrees). Stopped and picked up my girlfriend - we were chatting outside the car while it idled. Then it stopped and never started again.
The engine jumped back and forth and backfired through the SPi-module. The engine is the 1108 cc and is sitting in an Uno from 1993. It never started when cold either.
I suspected the ignition / vacuum advance and got a scrapyard spare. No progression. The vacuum on my last distributor was not working, but the engine ran anyway.
So today:
I bought a compression tester to check each cylinder. I refer to cylinder 1 as the leftmost when looking down into the engine bay (is that correct?). Well - tested for spark against top, and it was fine. Backfire through intake and no start. Compression shows 12 bar.
Next cylinder. Same procedure. Compression shows 9,5-10 bar. A little lesser.
Next cylinder - number 3 from left. There is a spark here as well, but with the plug removed the engine starts [:0][:0][:0]. It's running smoothly on 3 cylinders, not jumping like hell as when it stopped earlier. No backfire.
The 4th cylinder is a copy of the 3rd. The same happens. Runs fine on 3 cylinders. What's interresting is that these two cylinders show the same compression: 8, but it falls slowly to 4 when the engine idles (still in 3 cylinders).
So - I packed all plugs in and started. B) NOT. Backfire and not a start at all.
Are these two cylinders sharing the pressure?
Why backfire when one of the plugs on cylinder 3 or 4 are out?
Is it the HEADGASKET? [xx(] Between two cylinders[?]
There is no milkshake in the oil filler, the camshaft and vents look fine. No water loss. No oil in water. New plugs, HT leads, oil, etc. one month ago before the MOT.
I'M IN THE DARK HERE! Please help
Morten.
gas lowered on abarth wheels. upgraded interior and visuals. audio through phoenix gold and BLOWN kenwood.
projects: air in and out.
Honey that ain't no pistol - that's my LOVE GUN.