Idling issue... but the TPS is set correctly

[shielsy]

chaps, i\'m having an issue with the idling of my FD. everything was fine last week as it completed the running-in mileage, went for the first service and check over. everything fine. i gave it a good drive on the way back and still fine.

the next day i take it to work, then on the way home give it another good drive. probably went up to 7k max, so wasnt thrashing the nuts off it. got home and the idle was rough as. was sat at bout 400-500rpm fluctuating up and down. it has been like this for the last few days now. it seems to drive fine when its going but is smelling quite rich, and is using an obscene amount of petrol. on deceleration whilst in gear it starts bucking lightly when you get lower than 2k. i have checked:

TPS is set to recommended voltage on both wires
MAP sensor hooked up fine
Sounds fine while cranking

i was wondering if you chaps had any other ideas of what to check before i make the long, long drive back to the rebuilder.

any help would be greatly appreciated.

[shielsy]

ah yes, forgot to mention. completely standard apart from a cat back exhaust and a turbo timer.

[FD3S Efini]

is this an FD mate?
 
is the car boosting ok?
 
also have you phoned your engine builder and asked for there advice also?
 
Kris

[shielsy]

yes its a 1993 FD.

seems to boost fine mate. have spoke to the engine builder and he has got me to check a few thinks, all of which seemed ok. the next step is to take it back to him but its a long arse drive.

i was just wondering if anyone had any ideas before i start booking time off work etc.

[FD3S Efini]

What was you asked to check just so we can rule them out?

[shielsy]

plug wires secure
he had a listen to the cranking over the phone
vac hoses (one looked slightly perished but no gaping holes)
map sensor

and i have checked the tps

[FEED Addict]

plug wires secure
he had a listen to the cranking over the phone
vac hoses (one looked slightly perished but no gaping holes)
map sensor
 
and i have checked the tps

You coming you the MK meet in April?
 
http://www.mazdarotaryclub.com/forums/showthread.php?t=62897
 
Sorry for changing the subject, also the misses was having this trouble on Sunday in the ques to FastShow so i will keep an eye on this thread!

[shielsy]

is there any chance a knackared catalytic converter could cause the symptoms i have?

im pretty sure my cat is past its best as there is a nasty rattle coming from it at low rpm.

[MaLicE]

could be the cat... but sounds very similar to mine which has turned out to be a chipped tip...

[shielsy]

I really hope it isn\'t...

I\'ve only had it for a week! If it is i\'m hoping the rebuild warranty should cover it...