Quote:
Originally Posted by gamefreakgc
That video was very helpful. You are right, tons of ping. What's worrisome is that it pinged up high too, above 4500 RPM when you floored it, that's a very bad sign. It's that high RPM ping that kills engines. I would stay out of boost entirely until we can find a fix as the last thing that you want is another rebuild.
I have two more relatively inexpensive things to try. If these don't work, you may want to consider removing and selling the supercharger as it only gets very expensive from here if you want to try and fix the issue. I know that's probably not what you want to hear but you do indeed have a ping happy 5VZ-FE on your hands.
1. Clean the Mass Air Flow sensor. Use carb cleaner or MAF sensor cleaner and you'll spray it on both the amber looking wires as well as the thin filiment wires tucked down in the sensor body. Use it liberally, spray for 5 sec, let it dry for 5, spray again, let it dry, etc. You can't hurt it but caked on dirt will. If you have the older turbine style MAF, the same wires are there just a little harder to get to. Let it dry completely before installing.
2. Replace your upstream oxygen sensor with a DENSO replacement. You can find your exact replacement here: ERROR: The request could not be satisfied. You are looking for a direct fit for your model, 4WD Auto, for example and should run for about $50, I buy mine off Amazon by searching the part number. If you have the much more expensive A/F sensor that costs nearly $200, you can try removing it and soaking it in acetone overnight (nail polish remover if you've got a girl in your life) as a replacement is expensive.
Both of these sensors are crucial for fuel delivery. If one of them is off it will cause all sorts of havoc on your fuel ratio and can cause the engine to run lean. You should also get an increase in gas mileage after you do both.
The last thing to try is what you thought, replace with a high flow fuel pump. Replace the fuel filter while you are at it too. Hope this helps point you in the right direction.
I also hope whomever rebuilt your engine didn't mess with the heads or the timing, otherwise we'll be chasing our tails for a long time with no results.
EDIT: Are you going to find yourself in NorCal any time soon in the near future? We could pinpoint the problem if I can see the engine in person. |
Replaced upstream O2 with Denso, thanks for the link Amazon was pretty cheap.
Replaced fuel pump with the Deatschwerks DW100 from Underdog Racing. Says that it is a slight higher flow than stock so figured it was a good option.
I do clean my MAF often as this rig sees dirt. Think the last time i cleaned was with in 6 months.
No Real change still has the ping noise in all RPM bands. however I can tell it is getting more Fuel. have not floored it, but it pulls better low end and takes more to get it to ping. maybe a placebo effect.
there are basically two noises going on. I can definitely identify the high gear low RPM ping. very evident sounds like Marbles rolling around in my exhaust.. or like really bad valve tap.
The high rpm ping/noise has more air to it almost like an exhaust leak sound. does ping sound different at the different RPM's or could this be another sound?
This is likely coming off and going up for sale.
