please help!! CEL code 4!

speedygonzalez · 01-12-2009, 10:18 PM

hi, in the past few days i bought a brand new engine air drain valve (air bleeder) that goes in top of the thermostat housing for my 87 mr2 n/a. as soon i installed it, i flushed the cooling system, refilled new 50/50 antifreeze, bled all the air bubbles in the system for 40 mins (it took me that long). also, i bought a new coolant temp. sensor in the water neck located in the rear cylinder head last week cause it gave me a CEL code 4 (which is coolant temp. sensor). anyways, the next two days, the CEL code 4 came back and i noticed that the motor started to overheat a little bit and running rough (power loss, weak). it felt like i was towing a boat behind me. i opened the radiator cap, top off a little antifreeze, ran the car for a few mins and still the same.

i also noticed that the oil pressure gauge was a little bit too high than normal when idling. so i ignored it. then yesterday i tried to start the car but no luck. it just crank and no start. after a few tries, it started but was idling from 1300 to 1500 rpm instead of 2000. and i know the mr2's idle high at 2000 rpm when cold. so i tried to give it gas and it just stalls. can someone tell me WHAT THE HELL IS GOING ON with my 87 n/a mr2!!?? sorry is so long, but i need to fix this issue since this is my only car i drive to work. please help!! P.S.- motor has been rebuilt and has 1000 miles on it.

speedygonzalez · 01-13-2009, 04:19 PM

ok i'm back just let everybody know that i fixed the issue with the coolant temp. sensor (square type). one of the metal pin inside the plastic connector was loose and wasn't making any contact, that's why my motor was overheating and running rough. i also installed a new temp. switch sender, it wasn't sending accurate reading for the water temp. gauge. thanks to those that gave me tips, advise and info.

01-12-2009, 10:18 PM	#1 (permalink)
speedygonzalez Toyota Freak Join Date: Jul 2008 Location: Cape Coral, FL Posts: 26 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	please help!! CEL code 4! hi, in the past few days i bought a brand new engine air drain valve (air bleeder) that goes in top of the thermostat housing for my 87 mr2 n/a. as soon i installed it, i flushed the cooling system, refilled new 50/50 antifreeze, bled all the air bubbles in the system for 40 mins (it took me that long). also, i bought a new coolant temp. sensor in the water neck located in the rear cylinder head last week cause it gave me a CEL code 4 (which is coolant temp. sensor). anyways, the next two days, the CEL code 4 came back and i noticed that the motor started to overheat a little bit and running rough (power loss, weak). it felt like i was towing a boat behind me. i opened the radiator cap, top off a little antifreeze, ran the car for a few mins and still the same. i also noticed that the oil pressure gauge was a little bit too high than normal when idling. so i ignored it. then yesterday i tried to start the car but no luck. it just crank and no start. after a few tries, it started but was idling from 1300 to 1500 rpm instead of 2000. and i know the mr2's idle high at 2000 rpm when cold. so i tried to give it gas and it just stalls. can someone tell me WHAT THE HELL IS GOING ON with my 87 n/a mr2!!?? sorry is so long, but i need to fix this issue since this is my only car i drive to work. please help!! P.S.- motor has been rebuilt and has 1000 miles on it.

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01-13-2009, 04:19 PM	#2 (permalink)
speedygonzalez Toyota Freak Join Date: Jul 2008 Location: Cape Coral, FL Posts: 26 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	ok i'm back just let everybody know that i fixed the issue with the coolant temp. sensor (square type). one of the metal pin inside the plastic connector was loose and wasn't making any contact, that's why my motor was overheating and running rough. i also installed a new temp. switch sender, it wasn't sending accurate reading for the water temp. gauge. thanks to those that gave me tips, advise and info.