1JZ SC300 will not rev past 2000 rpm STILL!
#1
Lead Lap
Thread Starter
1JZ SC300 will not rev past 2000 rpm STILL!
Years later. I have changed stuff, cursed, prayed and Im still in the same boat.
1JZGTE from a manual 92 Soarer.
Swapped into 92 OEM manual SC300
Crashed
Swapped into 92 SC400
Ran fine then a wire arched out on the frame and blew fuses. After repair the engine would not rev past 2k.
Swapped into 92 OEM 5spd.
Same problem
Tried:
New ECU with caps serviced
New Alternator
Two MAP sensors
brand new TPS
New 255lph fuel pump. (helped car run better)
New fuel filter (helped car run better)
Double checked wiring
pinched my girls bum
new spark plugs
checked coil packs
Checked MAP hose
MAP wiring
Coil Wiring
The entire harness has been out of the engine. Like Intake manifold apart and the wiring checked.
I am stumped.
My mechanic is stumped.
AAron @driftmotion is stumped.
Anyone have any ideas or suggestions please enlighten me.
1JZGTE from a manual 92 Soarer.
Swapped into 92 OEM manual SC300
Crashed
Swapped into 92 SC400
Ran fine then a wire arched out on the frame and blew fuses. After repair the engine would not rev past 2k.
Swapped into 92 OEM 5spd.
Same problem
Tried:
New ECU with caps serviced
New Alternator
Two MAP sensors
brand new TPS
New 255lph fuel pump. (helped car run better)
New fuel filter (helped car run better)
Double checked wiring
pinched my girls bum
new spark plugs
checked coil packs
Checked MAP hose
MAP wiring
Coil Wiring
The entire harness has been out of the engine. Like Intake manifold apart and the wiring checked.
I am stumped.
My mechanic is stumped.
AAron @driftmotion is stumped.
Anyone have any ideas or suggestions please enlighten me.
#4
Lexus Test Driver
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Check coolant temp wiring for proper connection and no pulled wires then check ,tps , both cam sensor and crank sensors plugs and refer to TSRM for proper ohm loads on sensor and on adjoining plugs. check coil packs for cracking and try removing coil wires independently with car running 1 coil at a time listen for change in sound. check igniter for correct voltage and ground.
LMK
Lastly make sure the timing star behind timing belt lower gear mounted to crank is securely attached to gear.
Sounds to me like it might be losing sync from crank trigger and cam position.
Do you have the 2 cam sensor wiring plugs reversed back on front cam and vice versa
LMK
Lastly make sure the timing star behind timing belt lower gear mounted to crank is securely attached to gear.
Sounds to me like it might be losing sync from crank trigger and cam position.
Do you have the 2 cam sensor wiring plugs reversed back on front cam and vice versa
#5
Lead Lap
Thread Starter
It was a wire in the wheel well. Not sure what it was too. It was repaired. Just about all the fuses in the kick panel blew. But that was in the SC400. I now swapped it into my SC300 which was running and driving fine before we put the engine in it.
Check coolant temp wiring for proper connection and no pulled wires then check ,tps , both cam sensor and crank sensors plugs and refer to TSRM for proper ohm loads on sensor and on adjoining plugs. check coil packs for cracking and try removing coil wires independently with car running 1 coil at a time listen for change in sound. check igniter for correct voltage and ground.
LMK
Lastly make sure the timing star behind timing belt lower gear mounted to crank is securely attached to gear.
Sounds to me like it might be losing sync from crank trigger and cam position.
Do you have the 2 cam sensor wiring plugs reversed back on front cam and vice versa
LMK
Lastly make sure the timing star behind timing belt lower gear mounted to crank is securely attached to gear.
Sounds to me like it might be losing sync from crank trigger and cam position.
Do you have the 2 cam sensor wiring plugs reversed back on front cam and vice versa
Now this wiring reversal on the cam sensors is interesting. I didn't know that could be possible. But what makes me rule this out is nothing changed from when the engine was running to it not running wiring wise in that regard so unless someone is trolling me...?? I will check it just in case.
If anyone is a reputable 1J/2J tech I will pay you to come out here and fix this and cover food and lodging. The car is at my mechanics shop and he is at his wits end and so am I.
Thanks for all the responses.
#6
Lexus Test Driver
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Did you check the ohm load on the cam and crank triggers as well as the shielded wire and plugs.
Are both knock sensors plugged in, the oil pressure switch and oil level sensors plugged in???
Are both knock sensors plugged in, the oil pressure switch and oil level sensors plugged in???
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#8
Lead Lap
Thread Starter
The engine revs over 2k with my friends Chaser ECU but it still runs super rough (undrivable) and CRAZY rich. My ecu will need new caps but there is definitely something else amiss.
#9
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The ECU can easily pick up cross talk (noise) and read those as improper position of crank/cam remember it needs both crank and cam signals to determine when to charge (negative signal) to igniter,coils and injectors!!!!
Make sure you check the coolant temp sensor as well as this little sensor will rain havoc on the ECU and will cause it to go into limp mode!!!
Make sure you check the coolant temp sensor as well as this little sensor will rain havoc on the ECU and will cause it to go into limp mode!!!
#12
My brother has the same issue.... He still can't figure his out! It's been about 2 years. His wideband is reading extremely rich at idle (9-10's) and as soon as any throttle is given, it gets dangerously lean, hence it not bring able to rev past 2k
#13
Instructor
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I mentioned the map sensor though Have you checked map voltage? Like i said i have seen similar issue with the car running super rich and wont rev past xx rpm. But it was at 3k where im at, maybe its 2k for yours? what is your map voltage? have you tested? it sounds very much like a map issue.
#14
Lead Lap
Thread Starter
Yes. My I did try 3 map sensors total. Still the same issue.
I am going to check the shielding on my wires and the coolant temp sensor which was suggested by my friend just yesterday. I did have an issue with that on my RB25. I just ordered a crank sensor and new connectors for my coil packs.
I am going to check the shielding on my wires and the coolant temp sensor which was suggested by my friend just yesterday. I did have an issue with that on my RB25. I just ordered a crank sensor and new connectors for my coil packs.