Help Request- No acceleration after going 10mph in reverse

noxor

New member
Hey all,

Just noticed this issue this week, can reproduce it every time.

Notes- 99 4runner, 4x4, auto, 130k miles on car. Trans is a used that was installed as is from a junkyard (supposedly with similar miles).

The issue- When going in reverse, everything is like normal than as soon as I get above 10mph the pedal "gives out" and the RPMs jump just like it would if in neutral. As soon as I slow down enough than I can go again, but it will once again repeat when going too fast.

Additionally, today I was in a drive through for about 5 minutes idling and it stalled, it has never done that before. I have had the truck since november and have put 3k miles on it with no problems. I have installed a new radiator and an inline external trans cooler when I first got it after the initial transmission problem.

Fluid levels and temps are good (have a torque OBD reader on phone and check it a lot). Also, there are no similar issues when in drive. This may have been an issue since I got the vehicle but I never went that quick in reverse until the other day, so I am not sure if this is a new issue or just a newly discovered one. The normal back out of a parking space etc has and still is smooth with no issues.

Any thoughts?
 
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Never read of this before. I've never tried going more than 10mph in reverse, mostly cuz I don't need to? I'd guess it's not normal but may try your experiment when I remember....

I would say until you know the cause don't repeat the condition, may cause damage?

The stall probably isn't related, perhaps cleaning IAC, MAF and other intake components would help with that?

Luck and enjoy the runner. :cowboy:
 
I would say until you know the cause don't repeat the condition, may cause damage?

The stall probably isn't related, perhaps cleaning IAC, MAF and other intake components would help with that?

Good advice I will plan to get these done this week! I have MAF cleaner already, the IAC I am just cleaning the contacts right?

Appreciate it
 

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