Xantia Idle problems

Morten · Post by **Morten** » 29 Jun 2005, 05:15

I have a '94 2.0 8V aut. which suddenly drops the idle to very low or stops. It appears when the engine is at normal operating temperatur. When I restart the engine, the idle speed rises very slowly to about 500 on the rev counter. This can happen many times a day, then it works normal for several days. I have not been able to se any pattern in this behaviour. Any ideas?

Post by **Richard Green** » 29 Jun 2005, 12:08

IAC valve, to test remove multi plug there are 4 pins A-D read 53 ohms and B-C 53 ohms, if that's OK clean the throttle body out and the IAC plunger " a good spray with wd40 " also look for vacuum pipe off or split.

Morten · Post by **Morten** » 29 Jun 2005, 13:36

Richard,
IAC Valve ? I need to have a look in the Haynes manual to see what that is
[:I]

Post by **Richard Green** » 29 Jun 2005, 14:11

Idle air control valve, this keeps the idle stable

106XS1998 · Post by **106XS1998** » 29 Jun 2005, 15:56

Have you looked at the temp sensor? or the MAP sensor if the Xantia has one?

Post by **Richard Green** » 29 Jun 2005, 17:04

the TEMP sensor and the MAP sensor leaves a fault code and the engine warning light will come on, where as the idle control valve sticking wont but all the items are valued in the problem.

Post by **RichardW** » 29 Jun 2005, 17:12

My Dad had similar trouble with his 1.8 when it was hot in 2003. After a couple of weeks it just died completely. Needed a new crank shaft position sensor.

Post by **Richard Green** » 29 Jun 2005, 17:26

the symptoms of the crank sensor would cut the engine out rather than give erratic idle but it is worth mentioning it because it is a common problem to all cars these days, the wires to the crank sensor get brittle after a few years due to heat then they short out and in most cases the engine just dies.

Morten · Post by **Morten** » 29 Jun 2005, 20:30

Will start to check out the IAC. Is it worth the money to have the car checked for fault codes at a Citroen garage?
Morten

106XS1998 · Post by **106XS1998** » 29 Jun 2005, 20:42

citroen will charge you about £40 for a fault code check, you could get your own fault checker for less! has your car got a map sensor?

Post by **Richard Green** » 29 Jun 2005, 20:58

now this my area 16 pin is the norm alda " computer connect point" ground pin 6 to earth and switch the ignition on the mil "engine warning light" will flash the codes, one long = ten and short busts= seconds and dont take it to a dealer, then take is fo a 20 mile run to restet the internal computer (its called a cysle)

Post by **Richard Green** » 29 Jun 2005, 21:03

ill talk you through it later because i'm not feeling well at the moment due to the heat.