# 1985 1.6 NA diesel missing when going up hills

**URL:** <https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825>\
**Category:** Maintenance/Repairs\
**Tags:** jetta, volkswagen\
**Created:** [October 25, 2010, 6:16pm UTC](https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825 "2010-10-25T18:16:52Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![codeee](https://avatars.discourse-cdn.com/v4/letter/c/7ba0ec/32.png) [@codeee](https://community.cartalk.com/u/codeee)\
**Post date:** [October 25, 2010, 6:16pm UTC](https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825/1 "2010-10-25T18:16:52Z")

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I have an 85 vw diesel that is missing really bad when going up hills. pull over let it sit, clears up tilll next hill, IP timing good, engine timeing good, good compression, worse when engine cool, getting worse over time. IP return lines clear, no air leaks, ??? I’m stumped

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [October 25, 2010, 6:26pm UTC](https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825/2 "2010-10-25T18:26:46Z")

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Fuel filter?

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**Author:** ![codeee](https://avatars.discourse-cdn.com/v4/letter/c/7ba0ec/32.png) [@codeee](https://community.cartalk.com/u/codeee)\
**Post date:** [October 25, 2010, 6:33pm UTC](https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825/3 "2010-10-25T18:33:19Z")

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Fuel Filter good/new.

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**Author:** ![warp.routine](https://avatars.discourse-cdn.com/v4/letter/w/cab0a1/32.png) [@warp.routine](https://community.cartalk.com/u/warp.routine)\
**Post date:** [October 25, 2010, 6:53pm UTC](https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825/4 "2010-10-25T18:53:00Z")

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does this happen even when your fuel tank is brimming full? I know you said no air leaks but I am still wondering if you are sucking in air bubbles when you go up a hill and the fuel flows to the back of the tank.

if thats not the issue is it missing on all cyl when goign uphill? I’d try some diesel cleaner/lubricant (the guys that make diesel911 in the red bottle make an excellet cleaner).

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**Author:** ![codeee](https://avatars.discourse-cdn.com/v4/letter/c/7ba0ec/32.png) [@codeee](https://community.cartalk.com/u/codeee)\
**Post date:** [October 25, 2010, 8:10pm UTC](https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825/5 "2010-10-25T20:10:11Z")

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Yeah, happens at all fuel levels. Have been running lucas fuel treatment. new injector nozzles too. have new injectors coming this week, but am skeptical. yes, starts to miss on all cylinders when going up hills

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [October 25, 2010, 8:58pm UTC](https://community.cartalk.com/t/1985-1-6-na-diesel-missing-when-going-up-hills/56825/6 "2010-10-25T20:58:13Z")

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Sounds like injection pump pressure might be low or there might be a filter sock on the fuel inlet inside the tank that is plugged up, starving the pump…