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Posted by: srozick Feb 20 2016, 04:40 PM

Hey, can you help.
We have a 73-914 1.7L. Under hard acceleration the engine cuts out and then we get a small back fire and the engine will catch.
If we gradually accelerate the engine performs fine but is under hard acceleration that we have a problem.
Can you possibly give us a direction to look to fix the problem.
New fuel pump, new fuel filters,, and the tank was cleaned and lines flushed 200 miles ago.
Thank for listening,

Posted by: mgphoto Feb 20 2016, 04:46 PM

Bad FI pressure regulator.

Posted by: The Cabinetmaker Feb 20 2016, 04:56 PM

Check your fuel filter. It's starving for fuel at wot.

Check dwell, then timing, and adjust valves too if it's been a while.

Posted by: nordfisch Feb 20 2016, 05:15 PM

No.

This behavior is typical for missing additive injector pulses during acceleration.

The throttle-valve-switch (TPS) switches contacts when opening the throttle and sends this information to the ECU.

Check and clean this unit inside- do not oil or grease the contacts. The electrical current is very low, grease will prevent contacting.

Look at this: https://oldtimer.tips/en/d-jetronic/58-throotleswitch

Regards
Norbert

Posted by: Series9 Feb 20 2016, 05:16 PM

That statement says to me: Change the fuel filter.

Anytime I clean a tank, I tell the customer to plan to change the fuel filter in 500 miles.

Posted by: srozick Feb 23 2016, 05:19 PM

Thanks Joe. This will be the first thing that we do. and the cheapest.

Posted by: srozick Feb 23 2016, 05:21 PM

Thanks Norbert.
Fuel filters first and then the TPS rebuild.

Posted by: The Cabinetmaker Feb 23 2016, 07:18 PM

Guess you must have missed my post.

Posted by: dflesburg Feb 24 2016, 10:58 AM

if it cuts out at 5800 it could be you have a rev limiting rotor.