Power Issues
#1
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Power Issues
My truck has run great until I went for a smog check. The dude adjusted my timing before running the test. When I left, it ran like absolute crap.
I checked the timing and it was at 10btdc, I put it closer to 12-14 and it seemed to run better. No pinging at all. After a few min, was back to low power (i mean 75 mph top speed). I did a tuneup, fuel filter, cap/rotor, plugs, airfilter and it helped a little bit, the cap was due, but not too bad. This helped a tiny bit, but still rough acceleration, as if the engine was working hard and accelerating with the e-brake on or something. When I had it apart to do the plugs, I noticed the TB really dirty, dumped half a can of TB cleaner into it, made the idle much smoother and no more hesitation. Runs MUCH better now, but there is still a hint of power loss, again, like i'm driving it around with e-brake partially pulled, and it is inconsistent, sometimes its fine and sometimes feels wierd. Is there some emissions device that could be retarding the timing or something? Bad knock sensor? I have no idea at this point. Its 80% back to normal but still lacking. No check engine lights ever. Ideas?
I checked the timing and it was at 10btdc, I put it closer to 12-14 and it seemed to run better. No pinging at all. After a few min, was back to low power (i mean 75 mph top speed). I did a tuneup, fuel filter, cap/rotor, plugs, airfilter and it helped a little bit, the cap was due, but not too bad. This helped a tiny bit, but still rough acceleration, as if the engine was working hard and accelerating with the e-brake on or something. When I had it apart to do the plugs, I noticed the TB really dirty, dumped half a can of TB cleaner into it, made the idle much smoother and no more hesitation. Runs MUCH better now, but there is still a hint of power loss, again, like i'm driving it around with e-brake partially pulled, and it is inconsistent, sometimes its fine and sometimes feels wierd. Is there some emissions device that could be retarding the timing or something? Bad knock sensor? I have no idea at this point. Its 80% back to normal but still lacking. No check engine lights ever. Ideas?
Last edited by LS1Steve; 12-14-2006 at 09:57 PM.
#2
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well it could be, just maybe a bad 02 sensor, causing rich condition, but you might check the TPS and see if it is working well. You cant get good timing with they are bad,
#3
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still having this problem. It runs much MUCH better now, but now and then has this intermittent slight power loss. I put 89 gas in and it seemed to run a little better. Sometimes I hit the gas and have full power, other times I push the pedal and feel the engine strain but not accelerate too much, seems like when it does this, the farther I push the pedal the less pull from the engine, and if I back off its a bit better. Is this still a timing thing? Does it retard under acceleration? Why only sometimes? I don't think its pinging but I could be wrong. I'm still idling differently now and then too. when warm, i can turn it off and start it and it will idle at 1k. sometimes when driving (warm) and I pull up to a stoplight, it will idle at 1500. no rhyme or reason, and only these two rpm's. no check engine lights ever. currently the timing reads 14btdc. if I set it alocer to 10-12, the idle drops and it runs with less power.
Last edited by LS1Steve; 12-22-2006 at 06:10 PM.
#4
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yes, I would check the 02 sensors
I just bought a 95 4runner, and I have noticed it acts the same way: sluggish at times and gets up and goes at others. I recently replaced the spark plugs, and the check engine light is on after doing that.
One question...I'm installing downey headers on my 4runner, and having a shop install a dual exhaust system for me. Should I have the 02 sensors replaced while I'm at it or keep the old one(s)?
I just bought a 95 4runner, and I have noticed it acts the same way: sluggish at times and gets up and goes at others. I recently replaced the spark plugs, and the check engine light is on after doing that.
One question...I'm installing downey headers on my 4runner, and having a shop install a dual exhaust system for me. Should I have the 02 sensors replaced while I'm at it or keep the old one(s)?
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