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6.9 Stumbles when reved

Started by Mr6.9, 25 February 2017, 12:51 AM

Randys01

The orig p/no was 0438 140 010 but I daresay it has changed over 40 years. There is only one type that will fit the early K jet tronic.  The later K and KE on say 560's uses a fatter injector. I have a 5 year old injector here and it is stamped with 0437502047.

Mr6.9

Quote from: Randys01 on 10 March 2017, 09:09 PM
The orig p/no was 0438 140 010 but I daresay it has changed over 40 years. There is only one type that will fit the early K jet tronic.  The later K and KE on say 560's uses a fatter injector. I have a 5 year old injector here and it is stamped with 0437502047.
That sounds about right. I just checked the forums service manual a few hours ago. No info for the 6.9, so i look up the a couple things on the 4.5 model. Part number for a 4.5(according to the service manual)is a 0437140010.  Local auto parts store give me the other number (0437502047). Guess i worried over nothing, but it does suggest the injectors are original. Wonder when parts stores switched parts numbers.

Mr6.9

Made some progress last night.  Installed new injectors on the drivers side and that appears to have made an improvement. Still stalling, first couple attempts, but not as bad and tailpipe is no longer wet on the drivers side. Still need to install the other 4, just didn't have time.

daantjie

Also check cold start injector. If it's leaking or constantly dumping fuel then also that will be problematic.
Daniel
1977 450 SEL 6.9 - Astralsilber

Mr6.9

Quote from: daantjie on 14 March 2017, 08:10 AM
Also check cold start injector. If it's leaking or constantly dumping fuel then also that will be problematic.
Can it cause the idle to surge when cold?

daantjie

Yes. It should only run for a few seconds based on input from the thermo time switch.  If it does not shut off or leaks it will constantly dump excess fuel into the intake.
Daniel
1977 450 SEL 6.9 - Astralsilber