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Missing / Flatspot / Missfire after 4,000rpm
Very easy to test this usually. Try give it half throttle instead of WOT through the gears. Most likely your coils are due a change.
Driving through the gears it drives great, up to 3,500 / 3,800 rpm, but more than half throttle, when it goes to 4,000 rpm, it’s just flat as anything, I was wondering if I had a vacuum leak or a turbo pipe leak as there was a feeling of no boost, but I think after what all you guys are saying, it’s the Coil that’s the issue.
Do a modern tsfi coil conversion. Best thing I ever did to my ABY. Driving it after conversion felt like it had a lighter flywheel fitted, weird explanation but great to drive.
Originally posted by UUUdirs2newcastleView Post
Would a leak from one of the little 3.5mm vacuum hoses that are all over the engine cause this if there was one perished? They all seem a little iffy. Probably 26 years old !
Yes, these little tubes are responsible for applying vacuum or boost pressure to the ECU to calculate fuel and timing and the Fuel Pressure Regulator to adjust fuel pressure.
If these tubes are not completely sealed and in perfect condition the car will not run right.
You won’t believe it ! I’ve found the boost leak! The rubber O - Ring on the MTM solid intake pipe had broken causing a air leak. I’m trying to source a new O-Ring now.
It least I only bought ‘ONE’ new Beru Coil. ! ha ha ha
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