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Old 10-22-2003, 12:23 AM
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Join Date: Aug 2000
Location: Livonia, MI USA
Posts: 99
Diesel Injector Cutout Test

I know that on electronically-controlled engines you can perform an injector cutout test, by disabling each injector in succession. Can I do the same with my '79 240D, by cracking the line fitting at each injector? I am getting a bad popping sound (like very loud spark knock) from one cylinder, and a very rough idle. This has now escalated into a noise I can hear in the passenger compartment while on the freeway even. It sounds like a rapid tapping. I suspect a clogged or bad injector. I would like to find the problem injector if possible. I had this same condition about 30,000 miles ago, at which time I replaced all four injectors with Bosch reman (about $40 each as I recall).
I plan to use Diesel purge this weekend to see if that alleviates the problem.
Any advice is appreciated.


Now you're suckin' Diesel!

'88 300SEL
'92 300D 2.5 Turbo
'96 Lincoln Town Car. The Jazzmobile.
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