lumpy running!

[willrayner2003]

when i start up the 172 from cold, the revs a bit lumpy, i know this is sometimes normal but every so often it does it quite bad! and also when you drive it for the first 5 minutes or so its a bit hesitant between about 1800 and 2500 revs, it sort of hold back and doesn't want to put the power down, i never nail the car from cold, but its just annoying because the road i drive down out of my estate is bumpy and the running of my car doesn't make the ride any better! the car has a 182 manifold, de-cat and stealth exhaust, could this be the problem one of my mates thinks it could be!

does anybody know what else it could be if so what do i need to do to stop it?

Cheers!

 

[mr.pink87]

ph1 or ph2?

 

[Damo_Sport]

normal

 

[jack_kemp]

Normal mate, they run s**t from cold.

 

[mr.pink87]

You should get a remap with the 182 manifold! Will sort the cold start issues aswell!

 

[willrayner2003]

Its a ph2 where's the best place for a remap in the northwest? Any recomendations?

 

[willrayner2003]

Near manchester!

 

[Ralphizzle]

Wait for it... wait for it! Coolant needs 70 degrees centergrade before the lumpyness dissappears. <3.000 rpm is max.

 

[phoenix1]

if the valve on the charcoal canister is messing around it will suck in air ,mixture goes rich to compensate gives you very lumpy/kangarooie between 1200-2000 ,cut pipe from cannister to manifold and block up manifold end it will run completly different almost normal