No power starting out, feels choked..

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CBradio
Posts: 283
Joined: Fri Apr 06, 2012 12:03 am
Location: Brooklyn

No power starting out, feels choked..

Post by CBradio »

Ive had this problem since i first bought the car.
I thought injectors, manifolds, new plugs, cap, rotor, points, etc would fix it, but it hasnt.

Basically the car runs strong when i get to higher speeds, but it feels like it struggles at lower speed especially when just out.

It feels choked, like its not getting air or something.

I adjusted the timing finally to spec.
The only thing i still need to do is change the ignition wires...
But i dont think ignition is the issue.

Any ideas?
1977 530ia
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Mike W.
Posts: 2889
Joined: Wed Aug 30, 2006 12:12 am
Location: Sonoma County

Post by Mike W. »

First, are you sure you got the timing right? Double check the procedure more than the setting. Next, check the retard diaphragm, if you're using stock specs, everything has to be right and the diaphragms do fail, and in spite of their name give a quick advance when you open the throttle. Finally, if everything is right, consider bumping in a little more advance and see what happens.
Mike W.



02 525ita. Wife's, aka grocery getter
02 530i. New to the fleet, 3 pedals.
03 QX4, AKA the Datsun. Finally got the 4WD vacationmoble to stop smoking.
07 Xterra. Still on the DL, a purchase from hell.
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xtlicious
Posts: 16
Joined: Tue Aug 21, 2012 10:36 am

Re: No power starting out, feels choked..

Post by xtlicious »

CBradio wrote:Basically the car runs strong when i get to higher speeds, but it feels like it struggles at lower speed especially when just out.
Did you get this problem straightened out?

Although a long shot solution, I had a similar problem. When starting from a stop sometimes the car would struggle and pretend like it had no power, but as soon as I let off the gas (or if I was just partially on the gas) it was fine. What was happening in my case was that there were some rust chunks in the tank that, when the in-tank pump really starting pulling the most (from a stop or any hard acceleration) it would suck them up into the screen and starve the pump wholly or partially. My initial solution was to pull out the in-tank pump assembly and use a magnetic pick-up tool to pull the chunks off of the floor of the gas tank. They'll all pretty much sit right in the built-in ring soldered to the bottom of the tank. This fixed my problem.

Later on I ended up dropping the tank and doing a salt + vinegar acid rinse which made it look 800% better and likely lengthened the life of my pumps and fuel filter.

You might also check the ground posts of the fuel pumps or test the pumps, themselves, as it sounds like a fuel starvation issue (they're not pumping enough at the most stressful times).
1981 528i 5sp
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