Has lost power. Starts great, runs well. Just doesn't have the former power. On the highway it will run fine for awhile in fifth gear, then will slow down until I shift down to fourth and bring it back up to speed. Then I can shift into fifth and it will run well for awhile before losing power again. Also has less power than before climbing hills. My mechanic has tried lots of things but can't find the problem. My wife loves the car just as it is, but I'd be happier if the problem could be fixed.
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Re: Tercel Wagon SR5 with 190,000 miles.
Tere may be no solution to this problem because the car has 200,000 miles on it however I can explain somewhat, when engines heat up occasionally we find break downs in efficiencies regarding to moving parts, (loosening up then binding ) this may however not be the problem it may be as simple as fuel pump fatigue after running a while and it can't deliver the appropriate fuel pressure. I would say perform commpression test to assess engine efficiency then evaluate ignition ensuring bright blue or purple spark coming from exposed sparkplug then ensure proper fuel pressure/delivery and check vaccuum pressure to ensure a steady reading of 18-20 pounds of vacuum ... got it if low vacuum replace all vacuum hose to eliminate porous condition of hose therbye leaking small amounts adding up to a larger total accumulative sum. causing poor performance. good luck
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I drive a 2008 VE SSV 6LT Commodore Sports Wagon
I have current issue with Engine runs rough, Engine light ON. Traction Control Off
I have checked, plugs and leads which were replace September 2013 and swapped them also with identical car to no resolve
Just trowing some suggestions out there, but, I would check the idle air control valve (solenoid) or the throttle position sensor. If they check out then my last guess would be the map sensor or the vaccuum to the map sensor. Hope I was able to help. Best wishes.
perhaps you need a new cap and roter a new spark plug wire set. they don;t like moisture. also check to see if you have any broken or leaking vacuum hoses. the worse case senerio would be that your head gasket is leaking--at cold temps a little antifreeze will enter until everything warms up and it seals shut due to metal expanding. but since you say it's cold weather only--this probably wou;dn't be the case. good luck.
Although this isn"t a proper fix, and may affect emissions, I ran accross this problem on a friend's 87 2wd wagon.
There is a dashpot that controls a lever the Idle set screw is on, I am guessing it is a decel valve that closes butterfly when coasting in gear. I never looked at a manual to figure out what controls the vacuum valve that is on the passenger side of the engine compartment, but if you disconect the vacuum line and plug it that lever will not back off and idle will remain where you set it with the adjustment screw.
Make sure the engine is warmed up and not on a fast idle cam before adjusting idle.
The car is a 5 speed, I not sure if automatic cars are the same.
The car idles fine now and still run's great and gets 37+ MPG with 240000 miles!
If you want to fix it properly you would have to diagnose why that dashpot is being actuated at idle