Westie73
Newbie
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Posts: 8
1985 Beta Coupe VX
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« on: February 27, 2011, 01:29:54 AM » |
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Hi guys
I have a coupe VX. I am embroiled in the never-ending search for reliability. I have had a problem with what I believe is a fuel issue, with a nod to a spark problem, for about 3 months.
The car has undergone trips up to Northampton Motorsport on 3 occasions now. Firstly last October they popped it on their rolling road, overhauled the carb, and tuned to suit. This solved a fuel pressure problem that I was having at the time.
About six weeks later, my exhaust downpipe started to blow, I ordered an SS replacement, but seeing as I have to use the car most days of the week, I had to have the existing one welded. While in a local (until then, trusted) garage, I asked them to also check the plugs, and change the oil and oil filter. With the job done I collected my VX. On the drive home, after about 10 mins there was a massive plume of smoke, like an engine giving up, out of the exhaust. I found out that they had overfilled the oil. Gutted, I had the car collected, they drained the oil, checked out the compression, filled the oil correctly, and clean up my engine bay.
A few weeks later, until just after Christmas, the VX started to have an engine juddering problem. I would be driving along, the car was up to temp, and at that time, I would get up to 5000rpm in 4th or 5th then I would get a severe engine juddering, ie, the revs would drop away, and it would come in and out, until I applied the clutch. I decided it needed to go back to Northampton Motor Sport because I assumed that the carb had been contaminated with oil and required another tune on their dyno. They did this, but also found that there was a fuel pressure problem due to a faulty fuel pump. They spent a number of hours checking it out, and eventually fitted a competition pump, and as far as they were concerned the problem was solved. I collected the car last weekend, and basically broke down on the way home after about 10 mins of driving. I managed to get her going and back to Northampton MS. They kept the car back, and we discussed the possibility of an electrical problem. During this past week, they fitted a competition ignition switch and a push button start, after believing that they had identified faulty ignition switch. And again told me that the car now drove beautifully, and without issue.
On my way home today, I have had all sorts of problems. The original problem is now quite bad. The VX idles beautifully, there is no issue with the ignition, I have also had a full SS system fitted, so along with the new fuel pump, the car runs, when it runs, very smoothly. However, the fuel delivery problem, or whatever it is, is back with a vengeance. The car gets up to temp no problem, then it starts to judder, with revs dropping away, I have to apply the clutch, rev her up again, and pop back under load. Driving around town, there does not seem to be a problem. Going up hills does seem to exacerbate the problem. My dad followed me home from Northampton today, and witnessed gear change flames coming from the exhaust, ie unburnt fuel igniting. Therefore I believe that the throttle and carb may be woking as they should, but that the fuel is not being ignited as it should. Can anyone please help, or shed some light on this.
Best regards Damian
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