Running like crap
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Staging Lane
Joined: Nov 2011
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From: VA
Running like crap Feels like its running on 7 cylinders, when I get on it a little bit it sounds like a subaru boxer engine and if I put it in 6th gear at 60ish the entire car shakes. The only codes I'm getting are knock sensor, tps, almost constant misfire and both rear o2 sensors which I will be changing tomorrow. I used one of those laser heat reading guns on all 8 exhaust ports and they were all within 50° of each other. Any idea what's wrong?
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From: Euless Tx
Feels like its running on 7 cylinders, when I get on it a little bit it sounds like a subaru boxer engine and if I put it in 6th gear at 60ish the entire car shakes. The only codes I'm getting are knock sensor, tps, almost constant misfire and both rear o2 sensors which I will be changing tomorrow. I used one of those laser heat reading guns on all 8 exhaust ports and they were all within 50° of each other. Any idea what's wrong?
Edit: You say a constant misfire. What code is it? p0300, or is it a specific cylinder?
Thread Starter
Staging Lane
Joined: Nov 2011
Posts: 52
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From: VA
threw a bunch of parts at it today to get rid of the codes but it still runs bad. only code i have now is muptiple cylinder misfire. i did get a unknown code p1122 i think it was. my only guess is one of the cylinders isnt firing.
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From: Euless Tx
Also, what all is done to the car?
Thread Starter
Staging Lane
Joined: Nov 2011
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From: VA
new fuel pump, both post-cat o2 sensors, tps and cleaned the maf. the p1122 code went away after i changed the tps. right after i changed the o2 sensors the car smoked very bad, pretty sure it was oil. the car also has a loud lifter tick and a lot of blow by.
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From: Euless Tx
That's not good. Are you 100% sure it's a lifter?
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Staging Lane
Joined: Nov 2011
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From: VA
no im not 100% sure. from what i have compared it to it sounds pretty much the same as lifter tick. might be a pushrod or rocker arm or..? i just bought this car a little over a week ago (rushed into it) not realizing it had problems besides the ticking noise. im starting to get really angry with this car thinking i should have got a HONDA.
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From: Euless Tx
no im not 100% sure. from what i have compared it to it sounds pretty much the same as lifter tick. might be a pushrod or rocker arm or..? i just bought this car a little over a week ago (rushed into it) not realizing it had problems besides the ticking noise. im starting to get really angry with this car thinking i should have got a HONDA.
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From: Euless Tx
Pulling the valve covers is extremely simple. The only thing you need to worry about is putting the rocker arms back on and making sure you torque them down right. 22 ft lbs of torque is what it should be.
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Staging Lane
Joined: Nov 2011
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From: VA
by the way, the car came with a diablo tuner but was on stock tune. i decided to try it out on the performance tune then put it back to stock when i was done playing. it was right after that when i noticed the car running like junk. maybe that has something to do with it?
Thread Starter
Staging Lane
Joined: Nov 2011
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From: VA
No I haven't. It probably sounds dumb but I don't want to change them unless it's a guaranteed problem because there is way to much work involved to change them. I'm going to take it to a mechanic tomorrow and see what they say.
When these cars throw a knock sensor code change them. I haven't seen a computer, harness, or a fake code for it yet. Knock sensors are critical for the performance of an ls or really any engine to detect knock and for the computer to know there is knock going on. Engines can be damaged do to knock. I wouldn't hesitate if I was you. And your car will run like crap too.
