Jump to content
  • When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

76 2002 weber, mech. fuel pump, dies at warm idle sometimes


derimc

Recommended Posts

my 1976 bmw 2002 has an e12 head and weber conversion. It runs fine 90% of the time...but, sometimes (even after driving on the freeway and car is warmed up well) it wil die when sitting at idle. Then it is hard to start. I can take off the air filter and cover the carb with my hand, crank it over, and this seems to provide enough vacuum to pull gas into the carb. After doing this a few times it will start right up again. Any ideas as to what the problem could be?? Any help is greatly appreciated. Thanks :)

Denny

1976 BMW 2002

E12 HEAD, DAILY RUNNER

Link to comment
Share on other sites

If you have a 32/36 carb, remove the idle jet from the passenger side of the carb and blow it out w/ compressed air (or use a fine wire to make sure it's not clogged). If you're running a 38/38 then you have idle jets on each side of the carb. And, also check the float level to verify that it's correctly adjusted (search the archieves for proper setting). I'd be inclined, without more info, to suspect the floats as the problem.

Bob Napier

Link to comment
Share on other sites

So,

I pulled the jet and cleaned it as you suggested (it was turned totally tight and later I fooled with it as I thought they were to be backed of 2 turns...). I reinserted it and started the car. I let it warm and drove it for awhile. I then let it sit at idle.....and sure enough, about 15 min later, it died. Sounds like I need to check the floats then? Appreciate the help. Thanks.

Denny

1976 BMW 2002

E12 HEAD, DAILY RUNNER

Link to comment
Share on other sites

Guest Anonymous

Another line of troubleshooting is focusing on the idle adjustment. It sounds like your timing may be retarded a bit, or you idle mixture leaned out more than it should. Remember, the '76 smogger has a temp switch that switches one of the mag valves. Review what the temp threshold does. It may retard the timing for smog purposes. Or it may be connected incorrectly, revies the diagram and make sure the vacuum pipes are correct. Determine if the temp switch that signals the mag valve is actually active at the temp specified. Make sure that there are no vacuum leaks in the system. For running purposes until you verify the smog hoses and vacuum system, try resetting the idle when the engine is at the hot temp where it fades.

Since the '76 w/ smog eqt. has a dusl action distributor advance, make sure your setting the idle with the retard side connected and the advance side disconnected and hose plugged. Then set the ball marker at 0 deg.

That gives the correct advance when the system is reconnected. And make sure your dwell is 59 deg. (about .016") Clean the points and make sure the condensor is not bad (leaky).

I know this is a lot of information but make sure your valves are set

at spec. (cold).

Finally, any water or solvents or 'treatments' in the fuel may change the RPM that the engine idles at. Alcohol, or stp, etc., have an effect on smooth idle. Once the sympton has been treated with the additive, just run on straight fuel. Try an octane rating higher that you typically buy.

Good Luck.

Link to comment
Share on other sites

Guest Anonymous

oh yeah, i forgot...make sure the automatic choke is out of the way when you set the idle. Otherwise, when the engine heats to OT the lack of choke makes the idle lower....sometimes in the stall range.

Link to comment
Share on other sites

so you have to find out if the carburetor is flooding or running out of gas. what you could do, is to take the lid of the carb off when you have the probem next. If the carb has no gas in it, then it is a fuel pump/filter problem. If there is gas running into the carb from the auxilliary venturies when the engine stalls, then the carb has a fuel pressure/sinking float/worn needle valve problem.

Remember, no more than 3 psi. Holley regulators are crap. The only good one is the Malpassi Filter King. We have those, $60 including shipping. Call me at 1-800-665-5031

Overseas Auto

Vancouver BC

1-800-665-5031

always on MSN z5551212@hotmail.com

www.overseas-auto.com

www.weberjets.com

www.piaalights.com

www.thejimhilton.com

Link to comment
Share on other sites

  • 1 month later...

Well.....just talked to Jim from overseas auto and bought a new mechanical fuel pump....arrived fast, going to put it in now. Also had the exhaust leak fixed.... I'll keep you posted on how this effects my fuel delivery problem.....

Thanks to all.

Denny

Denny

1976 BMW 2002

E12 HEAD, DAILY RUNNER

Link to comment
Share on other sites

  • 4 weeks later...

Well here we are weeks later and the car has not died once while idling. Must have been the mechanical fuel pump. These cars are great. LOVE IT! Thanks to all who helped, my sincerest appreciation!

Denny

Denny

1976 BMW 2002

E12 HEAD, DAILY RUNNER

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

  • Supporting Vendors

×
×
  • Create New...