1989 nissan pickup headgasket

Blown headgasket or cracked head. The compression stroke is leaking into the cooling system and the pump cannot overcome the ressure. A compression test of each cylinder will confirm this.

Is your clutch master cylinder about empty,your slave cylinder could be bad and leaking,also look for leakage at clutch master cylinder,go to transmission and see if leakage is at slave cylinder,here's how to replace,Here's the part.Here's my 85 Nissan 4x4.

NEED MORE INFORMATION, BUT IT SOUNDS TO ME LIKE A BLOWN HEADGASKET OR A SENSOR IS NO LONGER WORKING PROPERLY SENDING FALSE READINGS TO YOU COMPUTER THUS CAUSING INCORRECT OPERATING PARAMETERS BY ECM

Check for white smoke out the exhaust. If you have white smoke then you are burning coolant and probably have a blown headgasket. Another way for checking a blown headgasket is to open the coolant overflow tank and run the car. If you see constant bubbles in the coolant then you have a blown headgasket.

DO NOT DRIVE YOUR CAR IF the gasket it blown as the engine will overheat and the cylinder head can warp/crack.

If there is no white smoke from the exhaust and no bubbles in the coolant system there is probably jsut a leak in the coolant system, visually check all the pipes and check around the waterpump housing for leaks. If you can't see a leak then pressure test the coolant system. A pressure test will push coolant out the leak and should help you find where it is.

Hope this helps

you have a blown headgasket. take spark plugs out and notice where they came from. if a plug looks clean like new and others look brown ,used, that is the cylinder that it is leaking into. also note the color of the oil. normal dark brown or is it overfull and a milky tanish brown. those also indicate a headgasket. But it is possible to have only one symptom and not the other or both.

Yes, lack of compression and fouled plugs too.

yes,check also coolant level,water pump,system for leaks as well

Head gasket, it doesn't care which way it leaks, it could be getting blown out when running but seeping in when not running. Is there steam coming out the exhaust? Is it overheating? A compression check will tell you what is going on. Radiator shop will do it for you. Hope this helps.

Sounds like maybe a blown headgasket between two cylinders. I've seen this plenty of times.

Your headgasket is blown between those cylenders