20 Most Recent 1990 Toyota Pickup - Page 7 Questions & Answers

check your idle jet isnt blocked in your carb,,if you can rev the motor up hi put a rag over the air intake on the carb,,hold onto it,,as the motor starts to die remove the rag ,this should **** the block out of the idle jet ,

i would do a compresstion test. If you cant see it loseing coolant on the ground it has to be in the motor, if the oil not milkie and you dont see smoke. ok fell the radiator up with water and let it get to warmed up dont drive it let it get warm. after it warms up open the hood look at your hoses be careful the coolent/water will be hot. first look at all the hoses see if any are swollen or cracked becareful give the motor little rpm like 2000 rpm's this will put more presher in the coolent system and you should see a leak if there is one lot of time you cant see if its leaking after you drive it some holes are very small if you cant find it let me know and i will have you try something else. theres 2 things there for you to try If you need further help, reach me via phone at https://www.6ya.com/expert/dennis_f849d3d6a68c6430

Have you checked to see if it has spark at the spark plugs, let me know. Actually there are two relays for the fuel pump, the EFI relay and the circuit opening relay, the circuit opening relay gets voltage from the EFI relay. If the computer doesn't get a spark confirmation signal while cranking then the injectors are shut off.

replace the plugs,. and check the plug wires, this is normally the cause of hot motors not starting,

DID YOU EVER CHANGE THE FUEL FILTER, ALSO COULD BE FUEL PUMP IN TANK ,,, CHECK FUEL PRESSURE !!!! OR VACCUM LEAK.. LISTEN FOR AIR A HISSING NOISE.......

What you are looking for are TERMINALS in the data link (check) connector. (see diagram below) The check connector is located near the No. 2 relay block on the right (passenger) side of the engine compartment. To check the timing on that engine you want to jumper the "T" and "E1" connectors.

Probably a faulty oil pressure relief valve.

If not done already, you should have an independent oil pressure gauge hooked up to the lube system by a mechanic to check that the high oil pressure reading you are getting is correct. Before doing this change the engine oil and the oil filter and ensure you use the correct oil and only fit a quality and correct spec oil filter.

You could have an engine that is running hot or your timing is out of adjustment. If the temp guage is still showing normal you could still have a hot cylinder usually caused by the computor leaning out the gas mixture in response to a too rich gas situation it perceives to occur. If the timimng is out of adjustment it needs to be tracked down, a worn timing belt or perhaps a loose sensor.

You definately should have the truck looked at by a professional soon. If not then you could be faced with large repair bills when the engine lets go. Hope this helps.

Try with the small stuff first. Replace the thermostat. Before you do that, you should flush and refill your system with just water after the flush process. The bottle of solution that you put into your radiator to flush it and clean it has instructions, follow those. Then let the car cool down and drain the system and refill it with fresh water only. Run this water for a bit and then do it once more. Once cooled back down , replace thermostat and replace the 50/50 mix of antifreeze and water.
Check engine oil level as well, low oil will overheat engines quickly.
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !!
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !!!