Astra cool running

How old is it?

Sounds like the temp sensor has gone. If that feeds the injection, it will be running rich (as for a cold start) all the time, hence the lousy consumption.

It's 1997 with 59000 on the clock Mike

Please have some knowledge before you answer the question.

The OP should check and replace his thermostat to restore correct running temp, which will have a massive effect on mpg into the bargain.

Tim..

I did think about that but when *my* 94 Astra Thermostat went the heater didn't warm up to more than lukewarm ever, so I went on to the next possibility.

Always willing to entertain other possibilities though. That's the joy of the IntarWeb thingy.

"Mike" wrote

Is there a problem or just

How long have you had the car? If "not long" then the thermostat may be missing. Beware, this may have been done to mask a more serious problem.

Probably the stat needs replacing. Engine runs cool, ECU thinks its not warmed up so riches the mixture and hey presto ....

NB I think the stat is behind the timing belt ....

thanks everyone. I'll get on to replacing that thermostat for starters

Mike

Other option other than stat is that someone's fitted a silly fan switch that cuts in at a lower temperature than standard.

Good luck - I asked small garage to replace my thermostat with similar symptoms to yours (on same vehicle) when renewing cam belt. Said they couldn't do it without ruining the thermostat cover bolts which had seized. (My engine ran at correct temp to start with.)

Last time I changed a thermostat, I replaced the housing mounting bolts with studs and nuts. Of course that guaranteed the thermostat would never fail again...

John

I am just about to change the stat, so the qustion is, where is it fitted? is it under the cam belt cover? P reg 1997 model 1.6 8 valve

Mike