Vehicle & Technical > Discovery

disco 1 3.9 V8 help needed..

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lee celtic:
Hi.. I need some help.. I have a 96 3.9 V8 running on petrol not gas. It has been fine for months since buying it but it has developed a fault.

When I accelerate up to 2000 rpm it's like running on kangaroo juice (violent juddering stop start lunging)  then at 2100 it clears and revs out fine. When I take my foot off the gas it drops right down and dies. after a few minutes wait it starts again. it's like this hot or cold.

I did find the pipe from the fuel regulator to idle housing had come off but replacing it made no difference. I'm thinking fuel starvation, maybe a blocked fuel filter slowing the flow and will be getting a new one on Monday but I was hoping you lot may have a few more ideas . I only want to make 1 trip to the shop so any other things I can look at now before shopping would be great.. It started after I put fuel in from a garage with all but one pump closed, I was thinking I might have put crud from their tanks into mine.. thanks..

andyb:
If it was fuel starvation then it would struggle to maintain high rpm, or would accelerate better on smaller throttle openings.

I would look at the throttle position sensor and/or the air flow meter.

lee celtic:
changed the filter and it was restricted compared with the new one, It made it better but it still chugs through the 1800- 2100 rev range.. I had a quick look at the air flow meter and it looks dirty inside. two questions then.. would this cause the struggle to get through the revs and if so how do I clean it?? (ie. what with) 

Thanks for the reply Andy..

Dr Neil:
you shud be o.k to use brake cleaner.

ukmudmaster:
My RRC did this the air flow meter was U/S, try WD40 on the plug/socket first though, a bit of damp in there causes grief,
Dave

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