shouldaboughttheZ

iTrader: (8)

My car has a vibration like a miss at idle. I get NO SES light at all, so I figured it has to be something minor. Car has 65k on it.

I have done the following to try and correct it:

Spark plug swap (factory to NGK-TR55's gapped to .055)
Spark plug wire swap (factory to Taylor 409 10.4mm)
Fuel filter (factory to WIX)
Cleaned throttle body and MAF out

I was going to change out the PCV valve, but the one at O'Reilly looks to be a different one (for 98-99 models).

Any other suggestions? Mods are in sig. Going to replace K&N with paper filter.

PREDATOR-Z

I've read that Taylor wires had issues, but I have no first hand experience with them. I use MSD

shouldaboughttheZ

iTrader: (8)

I have not heard about any issues on them. But this problem was there before the Taylors got installed.

PREDATOR-Z

Scan it to determine which cylinders. and go from there.

shouldaboughttheZ

iTrader: (8)

I don't have a scanner and get no ses light.
Just take it down to Autozone and have them scan it?

PREDATOR-Z

SES comes on in case of multiple missfires. If only one cylinder does it it won't SES.

If the have an oscilloscope scan yes.
OR FYI, there is a new tool on the market (PRO SCAN).......> sponsor.

shouldaboughttheZ

iTrader: (8)

checked out Pro Scans website and it looks pretty good. Will have to try and talk the wife into letting me get this.

WS6snake-eater

What part of Houston are you in? If you are close I might be able to take a look at it.

shouldaboughttheZ

iTrader: (8)

I am in the NW Houston. 290 and Beltway 8

I got it fixed. Ended up being a $2 PCV valve. Car runs really smooth now.

shouldaboughttheZ

iTrader: (8)

Now the damn thing is back. What the hell is going on? I was going to get the scanner as mentioned above but have not been able to yet.

UnleashedBeast

iTrader: (2)

I think mine does the same thing, let me know what you find out so I can make sure that's not my problem.

UnleashedBeast

iTrader: (2)

Did you discover your problem yet. I have the same problem and I am trying to fix it. Let me know what you find out so that I can see if it helps me.

shouldaboughttheZ

iTrader: (8)

I took it to my older brother who is a mechanic and he scanned it with a Genisys scanner. It showed multiple misfires at idle, and some during throttle loads. I had no SES light. He was almost stumped.
Then he decided to do a relearn on the crank position sensor. It would not do it. So he did an osilloscope on the sensor and found it did not have consistant readings. It would have a long them some short ones and doing this randomly. There for the computer was trying to adjust everything it was recieveing from the sensor.
I am getting a new sensor this weekend.

jyeager

Well, the CPS might actually be right and you could have a bad timing chain. Doesn't the service manual specify a test procedure for the CPS? Or how about validating the timing chain first. You can do it by taking off a valve cover and turning the crank by hand. Watch to see how far you can turn the crank either way before the valves begin to move.
That will be a whole lot easier than swapping the CPS on a whim...isn't it at the back of the block necessitating an engine pull?

oange ss

iTrader: (50)

no, its above the starter

shouldaboughttheZ

iTrader: (8)

We tried to get the CPS to do the relearn procedure, and had no luck. Tried quit a few times. Thats when he said that must be your problem.

Can you specifiy alittle more on the timing chain procedure. I don't have a manual nor can I find one. How far should it go before the valves start to open?

UnleashedBeast

iTrader: (2)

Well, keep us posted b/c I want to check mine to see if that's my problem too.

shouldaboughttheZ

iTrader: (8)

I will. Couldn't afford the sensor this week. Next week is the "free check" (5 weeks in this month), and am going to order it thursday so I can pick it up on Friday. Will keep you informed.