Preignition problem.. HELP
Hi everybody,
I have just bought a used 99 tacoma V6 Manual transmission with ext. cab with 225K miles. The truck is in a great shape and I am trying to fix it up so hopefully I can drive another 225K. I have done some part replacements so far, I put new KYB shocks, new Valeo clutch kit, K&N air filter, new plugs and got it checked for combustion pressure which was around 170 f/s( the lowest was 165 the highest was 170). It was winter time when I bought this vehicle couple months ago, and It was runing great. When the weather started warming up, it started pining(like a diesel truck) in low rpm after 2nd gear and the check engine light came up. When I asked my mechanic he sad the problem was Preignition. My mechanic is VW tech and he has VW diagnostic computer, when he checked for the problem, it came back with Oxygen sensor failure. Now the question that I have is "Could Oxygen sensors cause Preignition" if not what else could cause it ? ( By the way I used some octane booster and premium gas and it helped a little but I can still hear it when I am going uphill. I am not sure if it will go away all the way or shall I keep putting premium untill it goes away?). I am planing to take it a Toyota service also, to see their diagnostics about the check engine light. I just dont want to put premium gas in it all the time and I dont know if it would be okay to drive with check engine light on all the time . I just want that damn preignition to go away completely. Please let me know what you think about it.
Second question is about the vibration that I have between 55-70 m/h. The truck drives smooth before 55m/h and after 70m/h. I dont know if it is normal or not but I can feel the vibration in the lower part of my body, the steering wheel feels fine. I have changed the shocks and there are brand new LXT Michelin tires on the truck and I have got them balanced again with active and passive balance machine. If you could also comment on this question I would appriciate. thanks again
Hi everybody,
I have just bought a used 99 tacoma V6 Manual transmission with ext. cab with 225K miles. The truck is in a great shape and I am trying to fix it up so hopefully I can drive another 225K. I have done some part replacements so far, I put new KYB shocks, new Valeo clutch kit, K&N air filter, new plugs and got it checked for combustion pressure which was around 170 f/s( the lowest was 165 the highest was 170). It was winter time when I bought this vehicle couple months ago, and It was runing great. When the weather started warming up, it started pining(like a diesel truck) in low rpm after 2nd gear and the check engine light came up. When I asked my mechanic he sad the problem was Preignition. My mechanic is VW tech and he has VW diagnostic computer, when he checked for the problem, it came back with Oxygen sensor failure. Now the question that I have is "Could Oxygen sensors cause Preignition" if not what else could cause it ? ( By the way I used some octane booster and premium gas and it helped a little but I can still hear it when I am going uphill. I am not sure if it will go away all the way or shall I keep putting premium untill it goes away?). I am planing to take it a Toyota service also, to see their diagnostics about the check engine light. I just dont want to put premium gas in it all the time and I dont know if it would be okay to drive with check engine light on all the time . I just want that damn preignition to go away completely. Please let me know what you think about it.
Second question is about the vibration that I have between 55-70 m/h. The truck drives smooth before 55m/h and after 70m/h. I dont know if it is normal or not but I can feel the vibration in the lower part of my body, the steering wheel feels fine. I have changed the shocks and there are brand new LXT Michelin tires on the truck and I have got them balanced again with active and passive balance machine. If you could also comment on this question I would appriciate. thanks again