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Old 06-20-2007, 05:11 PM
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Kuhlrover Kuhlrover is offline
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Join Date: Mar 2007
Location: Washington
Posts: 122
I don't think it is pre-ignition as you describe it. I suggest stop calling it pre-ignition. From what you descibe it sounds more like a miss or "no-ignition". I doubt if the cetane boost or the EGR will have any affect on the problem you describe.

You said it runs fine at 4000 RPM? Is this driving down the highway or with the engine racing while the car is parked? It will make difference in understanding how much fuel is being used by the engine. If you are screaming down the highway at 4000 RPM and I am guessing 85 MPH then you are using quite a bit of fuel. However, if you are racing the engine while it is parked, it using very little fuel to get the engine at this RPM.

Number one rule with diesel engines when they start giving you grief is to replace the fuel filters. If you take it to a diesel mechanic that is what they will do. Since the next step is to run some diesel purge through it to clean out any gunk out of the system, you might as well run the diesel purge through before you change the filters. After that I would start looking to see if you have a bad injector or a worn injection pump.

EPA 609 & 608 HVAC Certified
83' 300D Turbo - 300K + Miles
00' 1.9L TDI Beetle
85' 6.5L Turbo, GV-OD, GMC Suburban,
67' 2.5L Diesel NA - Land Rover Series IIA

Here's what you do if it's so cold your diesel fuel gels. Smear some on some toast and stay inside until it warms up outside.
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