Fiat twin cam

[Hectors house]

Hi
Any pointers on what could be wrong i have a 2ltr fiat twin cam running a DTA ecu twin 40 jenvey throttle bodies
Problem when drops to tick over adjust to 800 revs then after a min or two tickover goes up and up on its own to 2000/2300 revs this is when up to temp
New plugs coil leads injectors checked fuel pressure ok Air into throttle bodies is even crankshaft sensor timing correct

[gazza285]

Sounds like an air leak. Is the brake servo working alright? Try disconnecting it and blocking the vacuum pipe.

[Hectors house]

Theres no brake servo

[gazza285]

Still sounds like an air leak.

[Hectors house]

Arrrrrrrrm yea i hear what you say its a total nightmare to disassemble thou i wonder if there is a way of checking ???

[GreenV8S]

Smoke test the intake manifold?

Do you have a vacuum ignition advance? Try blocking that off just to see whether that's provoking it. Have you checked the mixture? If it's missing cold enrichment it may have an artificially low cold idle and then pick up when the mixture comes right for the temperature.

Edited by GreenV8S on Monday 16th November 21:42

[gazza285]

Hectors house said:

Arrrrrrrrm yea i hear what you say its a total nightmare to disassemble thou i wonder if there is a way of checking ???

Easy Start. Squirt it around the manifold and see if the revs rise. Plus it smells ace.