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I have a 1986 Nissan D21 Hardbody 4x4. It was over heating…

I have a 1986 Nissan...
I have a 1986 Nissan D21 Hardbody 4x4. It was over heating intermittently. It never totally overheated. So I replaced the thermostat and the water pump. It hasn't overheated since, but now it runs really rough when it is cold. After it is warmed up it doesn't have problems.
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Answered in 33 minutes by:
9/18/2017
Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 21,587
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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Hello my name is ***** ***** thank you for your question.

How long does it run ruff when first started?

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Customer reply replied 9 months ago
It runs rough until it gets up to temp. Sometimes you actually have to rev it because it wont stay at idle. Then if you try to gun it, it bogs down and quits. My son said it was smoking this morning and i don't remember it doing that before.

If you pull the spark plugs out, and look down at the pisitons, are any of them looking fairly clean? You should see a layer of carbon on them. So you really shouldn't see any metal. Also let me know what brand spark plugs you have installed?

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Customer reply replied 9 months ago
NGK plugs B6HS, The pistons seam to have a layer of carbon on them. No metal that is all that visible.

Ok.. That is good with the plugs.. I am thinking that you may have a bad head gasket. When the truck cools down, coolant seeps into the cylinders and that is why it runs ruff when first started. I would have it checked to verify.

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Customer reply replied 9 months ago
would a bad head gasket reduce gas mileage or make the truck burn oil? It doesn't have leaks but needs a quart or 2 every month.

A clogged PCV valve can cause a oil consumption issue which could effect Miles per gallon.

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Customer reply replied 9 months ago
Ok i will check those out. Thanks for your assistance

Your welcome and thank you for using JustAnswer.com

Don't forget to Rate me if your Satisfied with my help. That is how I get credit for my work. You can Rate me by clicking the Stars at the top of the page. I hope I have provided you with Excellent Service

Thanks Jay!

Jay
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 21,587
Experience: 20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
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