Your fuel pump has probably been operation at max psi and not bypassing thru the resistor. You may also have a bad FPR or vsv for the FPR . Your fuel trims are negative so I believe the ecu has been trying to lean it out
High Idle! Fzj80 idles at 3,000 RPM??
- Thread starter jbee
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- Thread starter
- #22
Weird, because every thread about the EFI fuse blowing start with a car won't start situation. This one starts and just wants to run at 3000 RPMs. I tinkered with the new throttle position sensor a little and now the car wants to idle on its own but it flips back-and-forth between 1500 and 2000 RPMs, like someone is sitting in there pushing the gas pedal.
I agree with tools r us on the coolant sensors now, the readings at cold engine and at full engine makes sense, intake air temperature is consistent with outside temperature and coolant temperature goes up to 190 and stays there.
I have the fuse panel out and flipped upside down, the wires are pretty burned on the back and the panel is melted a little, my plan is to pull the wires out and put an in-line fuse holder in there and put a 15 amp back in just to see if it will run normally before blowing the fuse again.
I agree with tools r us on the coolant sensors now, the readings at cold engine and at full engine makes sense, intake air temperature is consistent with outside temperature and coolant temperature goes up to 190 and stays there.
I have the fuse panel out and flipped upside down, the wires are pretty burned on the back and the panel is melted a little, my plan is to pull the wires out and put an in-line fuse holder in there and put a 15 amp back in just to see if it will run normally before blowing the fuse again.
I'm just guessing here which Is all I can do. That fuse Is a sign of a resistance building very slowly, Like overheated wires do. Check your wireing harness by EGR, when wheeling You may have pulled things or moved It enough, If bad, to cause this new Issue. Good Luck. !
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- Thread starter
- #24
Replaced the EFI fuse and no effect on how the vehicle runs. I dialed in the throttle position sensor and now instead of running to 3300 and staying, it starts at 2000 and then settles into flipping back-and-forth between 1500 and 2000.
In related news, found that the O2 sensor wiring harness is laying on the front driveshaft and has worn a couple smooth places there. Will try to get it on the lift this weekend and test all of those wires. Fun times. I did have front and rear O2 sensor codes so no real surprise here.
I'm hoping that this is all related, many reports here on the forum of those 02 wires being compromised and popping that EFI fuse. Who knows.
In related news, found that the O2 sensor wiring harness is laying on the front driveshaft and has worn a couple smooth places there. Will try to get it on the lift this weekend and test all of those wires. Fun times. I did have front and rear O2 sensor codes so no real surprise here.
I'm hoping that this is all related, many reports here on the forum of those 02 wires being compromised and popping that EFI fuse. Who knows.
The way you describe it bouncing around it sounds like it has to be an electrical issue.
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What codes is it showing? I would do the TPS tests at the ECU to be sure there are no harness issues.
IIRC, if it's the heater wire, would explain the excessive draw on the fuse.
- Thread starter
- #27
***Edit; this was wrong. Fuse was melted but NOT blown. ***
It's interesting to me that the car still starts, runs, drives with that fuse popped. What does the EFI fuse do?
I'm thrilled that it did not leave me stranded.
Is the EFI fuse the link between the computer and ??
It's interesting to me that the car still starts, runs, drives with that fuse popped. What does the EFI fuse do?
I'm thrilled that it did not leave me stranded.
Is the EFI fuse the link between the computer and ??
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I had the same issue as you. Idle would go up and down between 800-2000rpms. Then it went away. Then it came back within a couple months. Once in awhile it would blow my efi fuse. It left me sit one day so I took it to a shop and they thought it was the fuel pump. Got a new pump. Went about 6 month with no issues. Now mine won't start because it blows the fuse as soon as I turn the key on. Trying to figure out what the problem is. Has to be something electrical. ....
- Thread starter
- #30
Upon inspection: O2 sensor Harness fell on driveshaft. Burned through the two yellow and red wires.
There was a O2 sensor CEL/MIL code before the weird idle thing.
Spliced the red and yellow wires (2) for 02 sensors (not sure which is which).
Swapped in two used but known good O2 sensors (thanks Inkpot) and the cold idle is now steady at 1100. Only had a few minutes so could not let it warm up to see if the idle drops.
I think the burned EFI fuse for me was the damaged O2 sensor wires.
I'm hoping the O2 sensors were the issue all along.
There was a O2 sensor CEL/MIL code before the weird idle thing.
Spliced the red and yellow wires (2) for 02 sensors (not sure which is which).
Swapped in two used but known good O2 sensors (thanks Inkpot) and the cold idle is now steady at 1100. Only had a few minutes so could not let it warm up to see if the idle drops.
I think the burned EFI fuse for me was the damaged O2 sensor wires.
I'm hoping the O2 sensors were the issue all along.
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Issue resolved?
- Thread starter
- #32
Yes! Sorry I should've reported back. I replaced both O2 sensors and problem solved. No further problems with EFI or weird idle. That thing runs great now with new TPS and IAC.