316 (Carb) Hunting And High Tickover problem

[Alex]

Hi ive got a 316 (Carb model) when you start it it ticks over at hight revs, not sure how many as rev counter is broken, but before all this happened it was hunting and some times after being driven, it was hunting worse than when you first started it.

does Any one no whats wrong i think it might be an air leak but not sure?????.

[kam-325i]

Possible Vacum/Air leak....

[Alex]

Im no mechanic so how would i find out if it was a vacum air leak

[Alex]

Oh also forgot to mention the temp dial only shows quarter after warmed up.

[kam-325i]

Has it got an Auto or Manual Choke ?

[johnnyboy]

I had a similar problem with my 316 carb, turned out that this hunting is a common problem with the Pierbourg carburettor, you can do a webber conversion! I never bothered, I ran my 316 with a hunting idle for about 4 years!

[Alex]

Its Got A Auto Choke

[Alex]

any one know what problem is????

[TroyAndEddie]

I just picked up an 89 316 with a similar issue. It only shows 1/4 warm after driving, but the ol' girl always gives me a heavy hesitation (sometimes to a stall) when I press the gas unless I'm REAL slow with the acceleration.

[martauto]

316,carb,auto

mine runs fine but hesitates when pulling away so if you find out ,let me know please
Mart.

[bmwe30mtech]

My 318i hunts also. And my temp never goes above a quarter either! I tried a new idle control valve, but it didnt fix it. BMW looked it over and found an air leak, but it didnt fix it! So now Theo is selling me a new air flow meter, and fingers crossed.. I will let you know if this sorts it.

Paul

[Alex]

Hi do you know where the air leak was

[bmwe30mtech]

Hi, sorry no i dont, they can pop up in a number of places really. I have been told by Dan that his car idle hunted also, showing the symptoms of our cars. He fitted a new air flow meter and it sorted it out. This is what i am going to try this weekend. I will let you know if it sorts it out.

Paul

[Alex]

Cheers, I will try a new air flow meter, do you know the best place to get one.

[bmwe30mtech]

If it sorts mine, then i recomend you get one, no reason to buy one now if it isnt the problem . Try ebay, although they always seem to be 325i ones on there?! Also just email somebody breaking a car with your engine in it.

Paul

[Martinaston]

If you have a carburettor you don't have an air flow meter.

Have you tried a new air filter ?
If not just take it out for now and see if it improves the idle.

[bmwe30mtech]

I just realised you have an M10 engine. Sorry for any confusion.

Paul

[Alex]

Ok i will try with out air filter and see if it improves.
Cheers

[Alex]

Nope still ticking over at high revs, i have fitted new clocks and its ticking over at 3,000 rpm ???????

[Martinaston]

did you fit the correct clocks ? there not all interchangable.

you say it's ticking over at 3k, but is it a steady 3k ?

[Alex]

well when you first start it it revs upto 3,000 rpm slowly takes about 10 secs then stays at 3,000rpm

[Alex]

Oh the clocks i had a motometer one in but rev counter and service lights did not work, so i fitted a set of vdo ones i did not think the vdo ones would fit but they have!!!!

[Martinaston]

Does the temp guage work the same as the old one ?
I'm not too sure you can swap them.

As for the idle problem the best you can do is pull all the electrical connectors off the carb and check the terminals for corrosion and make sure all the vacuum hoses are clear, pay perticular attention to the auto choke and temp sensor ones.

What happens if you run it with the air filter cover off and hold the choke flap open ?

[Alex]

well ive swaped them and every thing works fine temp gauge mph, and so on, i tryed with air filter cover off and it makes no difference, i have not touched the choke flap????

could it possibly be the carb as i might go to scrap yard and get a e21 316 carb and try that as theres a e21 316 with 40,000 on the clock so carb should be good.

[Martinaston]

40k and it's in the yard
you sure it ain't been round the clock

[Alex]

nope sure not seat wasnt even worn, i think someone had started to restore it but couldnt be arsed, as lights etc are in boxes in car, i was thinking about restoring it my self, but then when i had a closer look some one had jacked it up in the wrong place and it had put a hole through the floor.

[Alex]

ive fixed the problem now there was a pipe that was connected to carb that had came off, which it was sucking to much air through