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Old 11-18-2018, 02:32 AM   #13
Sweep
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Join Date: Dec 2014
Location: Peterborough - UK
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Quote:
Originally Posted by crogthomas View Post
Then your problem lies elsewhere, don't complicate things by adding a recirculating bypass valve, it's not required for the engine to run or idle.
A rough idle is almost always down to a air leak somewhere. Unless there is something not set up correctly. Was it fine before?
A fair comment, it's not been on the road for 3 years but yes it was fine when I picked it up. I don't currently have any sort of boost control so the little port on the compressor housing isn't connected, could that be an air leak causing it to die?

Quote:
Originally Posted by InferiorWang View Post
I've noticed 3 things that can cause idle roughness on these engines:

1) vacuum leak
2) bad AMM
3) dead in tank fuel pump

If you know your pumps are good and you've tested with a spare AMM, I'd look for vacuum leaks like crogthomas suggested.
I bought the 012 from a member on here under the impression it was a good unit.
Pump is a Walbro 255.
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