GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

changed fuel filter on the diesel, now very sluggish in mornings

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Old 04-20-2018, 05:19 PM
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X166 gls450 2017
changed fuel filter on the diesel, now very sluggish in mornings

i swappwd out the fuel filter used old heater but i filled it with liqui moly diesel injector cleaner, car started up fine, runs good when warmed up but in the mornings it needs way more throttle to just move for 15 mins or so, I believe till the filter warms up, I think the heater is fried, would someone confirm the symptoms of a shot fuel heater ? no light on the dash

I hope the HPFP is fine..


thanks

Last edited by 007_e350; 04-20-2018 at 05:54 PM.
Old 04-22-2018, 09:08 AM
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alx
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Measure resistance across heater- should be a few ohms. Fuel filter heater failure is rare. Are you sure you have installed the intake correctly? Mafs plugged in? If heater checks out you need to read the car for clues.

Last edited by alx; 04-22-2018 at 09:37 PM.

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