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Tii just bought car and week later the engine is hunting


Guest Anonymous
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Guest Anonymous

Hello I need to get some advice.I just bought a 74 tii

and about a week later the car as it stands now is

hunting.It idles about 3000-4000 rpms in the morning

after it warms up it starts to hunt looking for a good

idle point.Idles at 800 then shoots to 1500 then back

to 800 it drives fine but it does what I described does

anybody have knowledge on the symptoms.One shop in palm

springs quoted about 2500 to fix the problem another

shop said about 100 Before droping down any money I

would like to know what is going on so I don'tget

ripped off.Had a new honda and every time I took it to

the dealer it cost me about 800 bucks that is when I

decide to sell it and buy a older

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Guest Anonymous

You need to get a copy of the set-up procedures and start from scratch ensuring everything is running properly.

Make sure Valves are correct and timing is set and then begin troubleshooting fuel injection. You can buy a copy of Mike McArtneys (Jaymic) book as it has the set-up proceedure in it. Can be bought on books.com called "bmw 2002 Restoration Guide"

Can someone PDF and send to this person? Also Steve and Rob this would be a good time to start a documents section so that when someone has a question we could send them to the link.

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Guest Anonymous

If you want to do any invesitgating yourself, you can use a hose of somekind and move it around to different components while the engine is running. If there is a vacuum leak you should be able to hear it through the hose (other end in your ear). It could be anything from the warmup regulator on the back of the fuel distributor pump to a dry/cracked gasket on the intake, or a cracked rubber hose, or a worn throttle shaft, or....

AFTER you have ruled out a vacuum leak, then you could try adjusting the air/fuel mixture. Not that difficult, but I would suggest reading up on it first.

Dan

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Guest Anonymous

...and it was a combination of things, but the biggest problem related to the play in the air flow meter and the little accelerator pump (on top of the airbox on the '74). We determine the cold start valve worked perfectly, but the linkage had a little play. We replaced this and then determined that a couple of vacuum lines were not connected or connected wrong. Then we determined that the play in the solid shaft was holding the idle high and then letting it drop while this really screwed up the accelerator pump.

The original troubleshooting guide was invaluable.

BTW, are you in Palm Springs or are you close to the coast in SoCal? My mechanic - Eurotech in Mission Viejo - has a ton of tii experience.

Brian

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Guest Anonymous

after you rule out vaccumm leaks, you can adjust the

injection system using a procedure in the yellow book "BMW

enthusiast companion", this is a quick and dirty method, but

its simplicity is good for an emergency situation until you find

a competent mechanic

Michael

72 tii

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