01 - 70mph is all shes got

J

joshua.adams.63

New member
70mph is all shes got

Hello all,

I have done a bunch of looking around on the problem I am having but need some help narrowing it down and have made some recent changes that might be the culprit. The truck is an 01 with 232,000 miles

THE PROBLEM: At 60 or 70 mph she has no more power if I am pegging it to get there, if I am slowly and gradually gaining speed it seems does fine. I have tested it with ECT and no ECT not different result in either pegging it or gradually gaining speed

THE CHANGES:
1)The air box that came on it was not a stock air box it was some kind of KN modified version, that housing broke from bouncing around off road, so I replaced it with a Volant. (No I do not buy into the CAI myth of more power, just wanted something somewhat cheap on the pocket book but still getting decent reviews.)

2) Brand new 285/75r/16 KO2's (old pair were also 285's but very worn)

WHAT I READ ABOUT IT:
Seems like it could be a clogged Cat? Also wondering if it could be the throttle position censor? Could it also be the transmission having trouble shifting at higher gears? Could if possibly be the oil getting on the MAF from the new filter?

My question also that this problem didn't occur till the new air intake was installed. And this past summer put over 2500 miles on her on teh high way travelling 75-80 no problem, any suggestions given the scenario?
 
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Lots of variables. Sufficient air sounds ok. Sufficient fuel? What kind of rpms is it doing at 70, about 2200? What does it do then? stumble, backfire if given more throttle or just nothing? Any cel codes thrown? Check even if no CEL light on, could be pending. Oil on maf could also be from plugged pcv. :cowboy:
 
I'd try and clean the MAF and reset the ECU by pulling the negative battery cable. Both free (or cheap if you have to buy MAF cleaner).

Any CEL's?
 
jgue467 said:
Lots of variables. Sufficient air sounds ok. Sufficient fuel? What kind of rpms is it doing at 70, about 2200? What does it do then? stumble, backfire if given more throttle or just nothing? Any cel codes thrown? Check even if no CEL light on, could be pending. Oil on maf could also be from plugged pcv. :cowboy:
Click to expand...
I was not able to recreate it at 70mph but was atrade 60-65, I have a video but it's having good trouble uploading. It was pegged at 60mph and around 3000rpm it woukd downshift I'd try to increase speed again and it wouldnot go any faster, just revved at 3000rpm.

https://youtu.be/4lO2IiFfDEY

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offroadxplr said:
I'd try and clean the MAF and reset the ECU by pulling the negative battery cable. Both free (or cheap if you have to buy MAF cleaner).

Any CEL's?
Click to expand...
I will try this and let everyone know. Thanks just keep hoping it's something other than the transmission.

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joshua.adams.63 said:
... It was pegged at 60mph and around 3000rpm it woukd downshift I'd try to increase speed again and it wouldnot go any faster, just revved at 3000rpm.

https://youtu.be/4lO2IiFfDEY

Sent from my SM-G920V using Tapatalk
Click to expand...

Something is not right. 2175rpms should get you 70mph on level roads at about sea level or so. Are you sure you don't have the OD override button on? When I hit my OD override at 70mph i get 3000 rpms.
 
jgue467 said:
Something is not right. 2175rpms should get you 70mph on level roads at about sea level or so. Are you sure you don't have the OD override button on? When I hit my OD override at 70mph i get 3000 rpms.
Click to expand...
It is a about 600ft above sea level and I am positive OD isn't on as far as me pressing the button.

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joshua.adams.63 said:
Even after watching the video above you still believe that?

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Click to expand...

yup, just got done replacing mine 30 mins ago. I have having the exact same symptoms as you are and now i have POWER again. Bang on your cats and listen for rattling and plug your hand with with tailpipe to see if you are getting any pressure, you should hear a whooshhhh if you're getting good output.
 
my92t4r said:
yup, just got done replacing mine 30 mins ago. I have having the exact same symptoms as you are and now i have POWER again. Bang on your cats and listen for rattling and plug your hand with with tailpipe to see if you are getting any pressure, you should hear a whooshhhh if you're getting good output.
Click to expand...
What brand did you replace them with or did you just delete them?

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joshua.adams.63 said:
I see those are only 99,00 do they have a direct fit for an 01? Secondly how much of a pain was it getting the bolts off from rust?

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Click to expand...


i believe they are the same for 99-02. Maybe another member with 01 chime in, but it fit mine perfectly.

Sawzall and PB Blaster is your friend
 
I would try to disconnect the downpipes from the exhaust manifolds and take her for a spin. She will be loud but at least you can see if you got your power back.
 
my92t4r said:
clogged cats...
Click to expand...

I don't know if it is clogged cats or for that matter if it will work at all on 4Runner cats. But, I use not work on early 90s VW Eurovans with the 5 cylinder Mercedes gas engine. They ran forever and many people ran them forever in poor tune. At least I think that's why so many had clogged cats.
What worked on some of them was get it nice and warm then give the cat a few firm raps with a rubber mallet while someone revs the engine. It might just dislodge enough build up to help you out for at least awhile.
 
JayRolla said:
I would try to disconnect the downpipes from the exhaust manifolds and take her for a spin. She will be loud but at least you can see if you got your power back.
Click to expand...
I will try that. Do you suggest just deleting since i live in a state without inspections?

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if the truck is automatic, by the video it is not a clogged cat, since flooring (as I understood you did) would make it downshift and hit more than 4000RPM.

Seems like your in limp mode for some reason

Definitely try to remove your downpipe before beginning any work on the cat, or at least if it is impossible to remove because of the probably seized bolts, try to disassemble the flange directly after the cat and have a look in there with a flash light.

But my most probable guess is that you forgot to plug back a sensor when you played with the air box. Go look around at all your connexions.
 
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