97 sr5 losing power/please help!

mercuryrising17

New member
First my problem and then some background on the vehicle.
A couple days ago I started having a little bit of power loss when starting to accelerate from a stop. The 4runner would be a little jumpy when turning onto a street or starting up from a stop light, but then would drive fairly decent. I thought at first it might be my tran fluid but i checked that and it is good. I put in some octane boos and injector cleaner last night(didnt drive more then 5 miles home thoug) and today the problem is just getting worse. I have a real loss of power while driving around town and the vehicle is just real sluggish.
A little history. It is a 97 4runner sr5 rwd v6 with 170k on it. Ive owned it for about 7 months now. After owning it for about a month I kept throwing a CEL for a missfire on cylinder 2. The truck ran fine though, but I tried swapping out wires and coil pack and plugs to see if I could get the code to jump cylinders. it never did however and the only thing i didnt swap was the Fuel injector. I drove it for a about a hundred miles with the cel on and then it just turned off and hasnt returned since(this has been about three months) Im resetting the computer now(unpllugging battery) and am going to take it on a spin now to see if a code comes back. First question is will the computer learn to accept the code after a while on a missfire and just ignore turning the cel back on? Second is where should i begin on diagnosing the problem? Take the cat or exaust off? Flush Tranny fluid? Replace plugs whires/(previous owner claims he changed them and timing belt just before i bought it) Could it be the rear diff?

Engine revs fine while in park or neatraul, but under load it just losses everything. I can drive it but its very un-responisve
Any ideas and suggestions would be appreciated
 
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Just picked up a fuel filter(as well as plugs and wires to try later if needed) will throw the filter on and see if that helps at all. Anything i should know about doing the filter before I start. First time working on Toyotas.
 
Just picked up a fuel filter(as well as plugs and wires to try later if needed) will throw the filter on and see if that helps at all. Anything i should know about doing the filter before I start. First time working on Toyotas.

I've yet to change mine, but seems I read about the line being temperamental and prone to leaking if not properly tightened. So keep that in mind—that some guys have run into this problem when reinstalling.
 
wasn't the fuel filter, trying spark plugs and wires now. If it was the MAF wouldnt that throw a code? Also I heard someone say that removing the 02 sensor might help me decide if its a cat problem? Should i remove the front or back one to relieve the pressure for a test?
 
Got the plugs and wires in and after a quick test drive it seems to have helped a lot, still a little sluggish but that might just be because its a 4 runner and im looking for it :) Maybe its time to straight pipe it to take the last little bit of resistance out of my power.

Thanks for all of the input and replies!
 
So here's an update. The plugs and wires helped with the jerky nature of the problem. However I have still been experiencing power hesitation when the pedal is applied. If i am rolling at about 30 MPH and press the accelerator it is life as normal. However from a stop or slow speed when I push it I just it doesn't want to shift and give me the proper power and acceleration. I replaced the PCV valve yesterday and that helped a lot with the power after 30 MPH and when the truck is warm it runs a lot better. I hooked it up to my buddy's computer the other day and it was showing up to thirty degrees of advanced timing. Timing belt was changed 20k ago but Is jumping some teeth the most likely reason. Would being a couple teeth off on the belt allow for good driving some times and horrible at others? What else could cause the high advanced timing numbers? Would a bad or dirty TPS cause that ever?


Thanks Guys!
 

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