FJ62 Hesitates, no power, rough idles at times (1 Viewer)
- Thread starter acoen
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- Thread starter
- #62
Guys
Ummm, I'm a Dumb A$$, the fuse was blown on the dome light. I thought I checked every fuse, the fuse was very old. Guess I wasn't thinking clearly when I checked them...electrially the vechicle is perfect. Now if I can figure why it runs horribly in closed loop....it is either sensors, AFM or ECM for sure. Fires right up, idles around 1k for a few minutes. Once it starts to warm, I put it in gear she bucks farts and stalls. I will check the AFM tonight when I get home using the FSM I downloaded for 10 bucks...Thank you COSkier1...I will report back.
Ummm, I'm a Dumb A$$, the fuse was blown on the dome light. I thought I checked every fuse, the fuse was very old. Guess I wasn't thinking clearly when I checked them...electrially the vechicle is perfect. Now if I can figure why it runs horribly in closed loop....it is either sensors, AFM or ECM for sure. Fires right up, idles around 1k for a few minutes. Once it starts to warm, I put it in gear she bucks farts and stalls. I will check the AFM tonight when I get home using the FSM I downloaded for 10 bucks...Thank you COSkier1...I will report back.
I didn't read every post so I don't know if anybody asked this question. Did you check the wire harness that goes into the MAF? I changed my air filter and found that one of the pins in the harness got pulled back and disconnected. It made my truck run like crap when it did that.
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- #64
That is a good call, never checked that....I will tonight when I check the AFM again....Thanks
You might also want to reverify that there are absolutely no cracks in the accordion tube between the AFM and the intake plenum. It could easily account for your symptoms. Flex it a bit and see if anything opens up.
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- #66
Yeah, that was one of the very first things I did. They are perfect! Bent them in half to see if there were any cracks or small holes...nothing. I sprayed all around every vacuum hose and intake with carb cleaner.....no leaks. I'm testing the AFM per factory specifications tonight. I'm down to thinking it is the AFM, Temp Sensor, Cold Start timer or Air temp sensor.
On a 1990 Chevrolet I worked on, it ran the same way but entirely too rich. I unplugged the temp sensor and it leaned out. The AFM is my guess....We will see. I will keep everyone posted. This may be the longest post ever by the time I figure out what the problem is.....It is no doubt simple!
Thanks guys.
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- #67
Well guys tested the AFM and it is perfectly good. I will check the sensors again on the next couple of days.
This is what I know.
1 AFM is good/air temp good (pins in good shape)
2 Spark seems good (1" or more blue spark)
3 No vacuum leaks
4 No more water in tank, new gas and Heet added.
5 plugs and wires good
6 Seems to run bad at closed loop
7 Fuel pressure and flow doesn't seem like an issue or it would run crappy in open loop.
Things to check again
1 coolant temp switch
2 cold start timer
3 cold start injector
4 igniter
5 ecm
Any other ideas?
If I need an ECM where can I get one reasonably anyone have a spare?
This is what I know.
1 AFM is good/air temp good (pins in good shape)
2 Spark seems good (1" or more blue spark)
3 No vacuum leaks
4 No more water in tank, new gas and Heet added.
5 plugs and wires good
6 Seems to run bad at closed loop
7 Fuel pressure and flow doesn't seem like an issue or it would run crappy in open loop.
Things to check again
1 coolant temp switch
2 cold start timer
3 cold start injector
4 igniter
5 ecm
Any other ideas?
If I need an ECM where can I get one reasonably anyone have a spare?
- Thread starter
- #69
I'm hoping this is not the case, but it may seem that way. I will check the connection and grounds to the ECM first. Any ideas how much good ones cost new?
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- #71
I will double check...Would the timing cause problems like I'm experiencing?
Yes, bad timing can make it run all kinds of crappy, up to and including not at all. Be sure to set it according to the FSM (you have to jumper the check connector)
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- #73
Thanks my friend....I will give it a look this weekend. It would make my year if it was that simple.
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- #74
Well, I found something this evening. I tried unplugging all of my sensors to see how it ran. While pulling on the coolant temp switch, it completly came apart. I had no codes(until it came apart), but that couldn't have been good (I was just pushing the little tank to remove the plug and it fell apart. I see no change when the sensor is pulled...This may be the problem! I will report tomorrow. I will time and check fuel pressure this weekend. I'm going to the wrecking yard to pick up a rubber fuel line with a banjo fitting on one end. I can then check fuel pressure....
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- #76
No offense, but I can't wait until you get it right. This has become a thread I am hooked on following. Have you checked to see if there's a "nest" of some type in the air filter housing?
No offense taken, truly...These are difficult vehicles to diagnose. I will check everything for sure....Who knows, I haven't checked the snorkle yet but maybe. The cruiser only really acts up in closed loop. No power and hesitates really bad when warm. The coolant sensor would make sense, once in closed loop if the coolant sensor doesn't work it will never send the signal to the ECU to richen the fuel mixture. The thing just snapped in half just trying to remove the plug, I'm sure it was bad, but not bad enough to send an error code.
Believe it or not I'm a good mechanic, but I don't do it every day. This is my second FJ62 my first one had little simple problems too that took forever to figure out. When I purchased this one it was like meeting that fine ex-girl friend again.....Thinking to your self why did I ever let that one get away....Then she opens her mouth....and you think...Ahhhh now I remember. This is exactly the way I'm starting to feel about this thing. I know most everything is good now it is getting it down to see what is actually bad. I'm almost positive once I replace the coolant sensor and adjust the timing and valves it will run better. This is really a sweet rig, new tires, perfect original paint, nice interior, not a single bit of rust, underside is very clean as is the engine compartment. I will post photos soon.
I have good
cap rotor plugs and wires,
good spark,
fuel flow and pressure
good AFM
good cold start system
good vacuum (by vacuum test and checking for leaks)
good grounds and cables.
new fpr and new tps
good fuel
new filters all around.
but this weekend, I will get the exact fuel pressure, set the timing to factory spec....I should be ready to go....keep your fingers crossed. the key is having a good baseline and I think I have that now. Just need to check on a couple of things...not much I can do during the week...30 minutes here and there.
I found both of my sensors(wires) toast there last weekend.......sure does not help
- Thread starter
- #79
I found both of my sensors(wires) toast there last weekend.......sure does not help
Thanks guys, I will fix it....I will no doubt determine that I have the wrong dipstick or something like that. The sensor was toast, this may be the problem that and timing. I will send a message once I figure it out....
btw - when you're verifying the timing, make sure it's also advancing correctly and put the timing light on all the plugs to make sure they're all firing reliably. Also, you might want to pull the EFI fuse for a while (?couple of hours) to force the ECU to reset itself to all it's defaults.
