Split linkage test

[jim 56]

Not sure I did the test(with no emission relays )When I press ip rod gat a slight rpm increase.When I press the throttle linkage down car stalls.I think that tells me it is too lean.What do I do next.

[ja17]

Your correct. First check your fuel pressure and volume, to make sure your getting adequate fuel supply. Often times a dirty filter can cause lean running. Next, you need to check to see if your engine linkages are set correctly "Linkage Tour". If the engine is in good tune you can try the linkage test above 2,000 rpms and then above 3500 rpms. If you find only the low range is lean (idle to 1700 rpms), then you can richen-up just this range by turning the knurled thumb screw on the back of the injection pump in a few clicks (clockwise sitting in the car) and make sure the engine is NOT running when you do this adjustment. If you find that the engine is running lean at all speed ranges you can make a whole injection system adjustment by turning the main IP rack screw or removing some shims under barometric compensator (easiest method). keep asking questions.

[Berggreen]

Your correct. First check your fuel pressure and volume, to make sure your getting adequate fuel supply. Often times a dirty filter can cause lean running. Next, you need to check to see if your engine linkages are set correctly "Linkage Tour". If the engine is in good tune you can try the linkage test above 2,000 rpms and then above 3500 rpms. If you find only the low range is lean (idle to 1700 rpms), then you can richen-up just this range by turning the knurled thumb screw on the back of the injection pump in a few clicks (clockwise sitting in the car) and make sure the engine is NOT running when you do this adjustment. If you find that the engine is running lean at all speed ranges you can make a whole injection system adjustment by turning the main IP rack screw or removing some shims under barometric compensator (easiest method). keep asking questions.

Great feedback Joe! I never thought of doing the split linkage test at higher rev ranges. 

Cheers,

Christian

[FGN59]

Forgive my ignorance, but how does one practically run the split link test at any revs higher than idle? My arms are not long enough to hold the two parts of the linkage while looking at the rev gauge

[Berggreen]

Forgive my ignorance, but how does one practically run the split link test at any revs higher than idle? My arms are not long enough to hold the two parts of the linkage while looking at the rev gauge

Sounds like a two-man job! 

[Pawel66]

Sounds like a two-man job! 

No, just a three hands man job.

[ja17]

Not that big a problem for the experienced "rpm" ear. However, most dwell meters have an RPM reading feature also. Otherwise, as suggested, two men will work!