Hope someone can help with this problem.
Purchased the vehicle a few months ago to start a catering business (Vehicle already modified). Finally got the business started this week on Monday.
After driving for about 2 hours (lots of stops), suddenly and most noticibly on bumpy roads the vehicle revs itself. If I'm in gear the causes acceleration, so I naturally take it out of gear which causes a max rev for about 5 seconds, then back to normal. During this a massive amount of black smoke comes from the exhaust. Again about 20 mins later same again. I take it out of gear and again massive rev noise from the engine and more smoke. If I keep accelerating rather than taking it out of gear I still get a lot of black smoke, but not the revs.
To make matters worse I was pulled by the police yesterday for the exessive smoke. He followed my for 4 miles and said he only noticed it once, so the smoke is not permanent, just on those occasions mentioned above.
I'm obviously panicking as I've purchased this vehicle and paid more as it's modified by Jiffy for catering. Hard to get hold of.
I've checked the acceleration cable is not sticking.
I've checked the oil and must have lost a good 1/2 pint from one mornings work of about 50 miles.
My father in-law is convinced the engine is 'knackered' and the vehicel needs scrapping. Not that easy when you need it daily for work, so I'll probably cling to any possibilites which could cause this.