TII stalling after high revs

[bendoty]

This has only happened after I've been on the freeway and had to push the clutch when coming to oncoming traffic and the car died. It would start up immediately by by bump start or by key ignition.

I have noticed the same thing when driving city streets when coming to a stop. It would not ddie, but the revs would drop to the point of almost dying.

The first time I really think it was krud in the fuel line but now I am noticing it more on a daily basis. Not bad, but just wondering about tuning the right.

[adawil2002]

Idle should be 850-950.

Check linkages for wear and slop. There should be no play. If there is replace the linkage rods, or the ends and re-measure to spec or JFPro BMW sells them pre-measured ready to install.

Re-sync KF to throttle body, then adjust idle.

[PaulTWinterton]

Could easily be, and easy to check.

Gas tank filter. 10min job to remove hoses and bolts.

You should be able to see through the filter on the bottom of the fuel pickup.

Not the usual symptom, but could be REALLY plugged.

If it's SORTA plugged, check other filters.

Worth a try.

__________________

73 Inka Tii, #2762958

[ray_]

And then timing and dwell.

Cheers,

Ray

Idle should be 850-950.

Check linkages for wear and slop. There should be no play. If there is replace the linkage rods, or the ends and re-measure to spec or JFPro BMW sells them pre-measured ready to install.

Re-sync KF to throttle body, then adjust idle.

[JsnPpp]

Definitely not tuned right. You probably aren't getting great MPG's either even though it likely drives "fine" other than the idle.

Once you get the linkages and ALL slop out, linkages are the right length, check the filters, clean plugs, cap/rotor, lube distributor, etc., make sure the timing is reasonably close and then go through the process of Tii tuning (multiple sources).

I recommend reading and learning what each piece of the Tii puzzle is and does, long term if you plan on tuning it yourself it means less ramp up time. There are many pieces but nothing insurmountable - for the most part it's bullet proof once dialed in.

~Jason

[bendoty]

Yes, my mileage sucks. Thanks for all the advice. I will starting going through all the tuning items mentioned.

Thanks

Ben

[Guest Anonymous]

If this happens whenever you apply the brakes, it's possible it's your brake booster or brake booster hose. Easy to test. Start the car, press the brakes. If the RPMs change, you know where to start your search.

[ray_]

I'm not in complete agreement. Quickly stepping on the brakes will shift the vacuum in the motor and give you an initial jump in idle.

Cheers,

Ray

If this happens whenever you apply the brakes, it's possible it's your brake booster or brake booster hose. Easy to test. Start the car, press the brakes. If the RPMs change, you know where to start your search.

[williamggruff]

I'm not in complete agreement. Quickly stepping on the brakes will shift the vacuum in the motor and give you an initial jump in idle.

Cheers,

Ray

If this happens whenever you apply the brakes, it's possible it's your brake booster or brake booster hose. Easy to test. Start the car, press the brakes. If the RPMs change, you know where to start your search.

Ray, if you ever find yourself in complete agreement with anything I've posted, seek immediate medical attention.

[ray_]

That I agree with.

What? Oh.

;-)

Ray

Ray, if you ever find yourself in complete agreement with anything I've posted, seek immediate medical attention.

[bendoty]

Checked the idle (900, thanks to Pat fot the Wunderbox) and the linkage seems firm, not sloppy. Tried to reproduce the the stalling (or at least drop in engine speed) after high revs and cannot. No issue with the brakes. I am thinking I just had some gunk in the fuel line, but will still work through the items recommended. Thanks to all.

Ben

[Danz3]

I have the same issue with my 74Tii.  I have it idling at 1000 and its steady as a rock.  The car seems to run fine at highway and around town speeds until I stop.  The revs drop and sometimes stalls.  A simple blip of the throttle brings it back to normal idle.  I followed the KF setting procedure, checked all linkages for length.  The 289 was long by 1mm and I adjusted it to the correct length.  The links are all new as some still have the BMW labels on them.  I disconnected the retard valve and plugged the vacuum lines.  That did make a bit of a difference but still it stalls and sputters at stop.  All ignition was checked cap, wires, plugs etc.  Timing is next.  Something tells me it's vacuum related but we'll see.  Any additional suggestions appreciated.

[BillWilliams]

A lean condition will present these symptoms too.

[jgerock]

A lean condition will present these symptoms too.

+1 on this. Do you hear a softly muffled backfire in the exhaust while slowing to a stop from driving?  Do you have an air/fuel meter?

[Danz3]

No backfire at all. I don't have any way to measure mixture other than exhaust smell and plug condition.