VN v8 hunting revs at idle

[GTP 85]

I have replaced and or changed everything that i can think of that would cause the idle of my car to hunt.

All replaced:
- IAC
- TPS
- O2 sensor
- All vacuum hoses
- Brake booster was leaking, replaced and it improved a bit
- Injectors

checked all points of vacuum

When the car was running dual fuel it idled perfect on gas but hunted on petrol. Since then i have removed the gas system and replaced the engine with a fresh one.

Could it have had some tweaks in the tune up to suit gas better? In other words, could the hunting be a problem in the tune?

[Kirbs]

Yerpp, Get it tuned. That should sort it out.

[Boonz]

map sensor, same as the V6 ones, usually you can tap on them when the idle is playing up and it runs fine for a minute then goes back to hunting again

[greenfoam]

I was in such a mental mess over you listing all that stuff and not changing the map sensor that I couldn't reply. Lucky benny was up for it

[strgas]

checked your manifold gaskets ??? vacum reading ??? is your PCV blocked or restricted ??? checked your engine breather pipe ???

[GTP 85]

thanks for replies

strgas: but the thing is.... it hunted on petrol on the old motor as well! pcv and breathers are clear/ new.

greenfoam: i have only really mechanically switched on to ecotecs, so the map sensor didn't scream out to me straight away.. my bad. i shall try that.

Are series 1 v6 and v8 map sensors the same by any chance?

[delcowizzid]

any map vn to vr v6 or v8 they all the same

[inocnt vn]

go the MAP,,,,,,,,,,,,,,,,,,,,,,,