Ive brought my car to 5 different mechanics to see if they can figure out my problem but none can give me a straight answer, only guesses. So before I start replacing things, I just want to hear from your opinion on what could be wrong.
First problem. Ive done compression tests and every cylinder but 6 was at 190-210 psi and cylinder 6 was at 120psi. It makes a misfire noise from the exhaust so I came to the conclusion of it being a bent valve. My cel is on every now and then and every time I check it, it has a random misfire and all cylinder misfire (p0300-p0306) all together. Now I asked a mechanic just to verify if it was a bent valve, he said from just listening to it, it doesn't sound like a bent valve so now im confuse.
The second problem that I cant seem to figure is that everytime when im around 38-42 mph and 58-62 mph, as I step on the gas in from between those mph, the car shakes very badly. I.e. as im going 60 mph and I step on the gas, it shakes but as soon as I let go of the gas, the shaking stops. At first I thought it was a bad or bent rim, but it doesn't make sense that it only shakes as I step on the gas. If the rim was bent, it should be shaking the entire time even when I let go of the gas.
The third problem is everytime as I slow down in a gear, and the rpm hits 2.5k, it vibrates my precats heat shield. Ive removed the front heat shield but the rear one is a little bit more difficult to get to so I just left it. Im not sure if its just because the heat shield is rusted and hanging on by just one or two bolt that would cause it to vibrate so loud or if something was wrong to make my engine vibrate at 2.5k rpm.
Any opinion and suggestion would greatly help.
First problem. Ive done compression tests and every cylinder but 6 was at 190-210 psi and cylinder 6 was at 120psi. It makes a misfire noise from the exhaust so I came to the conclusion of it being a bent valve. My cel is on every now and then and every time I check it, it has a random misfire and all cylinder misfire (p0300-p0306) all together. Now I asked a mechanic just to verify if it was a bent valve, he said from just listening to it, it doesn't sound like a bent valve so now im confuse.
The second problem that I cant seem to figure is that everytime when im around 38-42 mph and 58-62 mph, as I step on the gas in from between those mph, the car shakes very badly. I.e. as im going 60 mph and I step on the gas, it shakes but as soon as I let go of the gas, the shaking stops. At first I thought it was a bad or bent rim, but it doesn't make sense that it only shakes as I step on the gas. If the rim was bent, it should be shaking the entire time even when I let go of the gas.
The third problem is everytime as I slow down in a gear, and the rpm hits 2.5k, it vibrates my precats heat shield. Ive removed the front heat shield but the rear one is a little bit more difficult to get to so I just left it. Im not sure if its just because the heat shield is rusted and hanging on by just one or two bolt that would cause it to vibrate so loud or if something was wrong to make my engine vibrate at 2.5k rpm.
Any opinion and suggestion would greatly help.