Cannot get this running right...
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Joined: Aug 2012
Posts: 5
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Cannot get this running right...
I've got a '97 with a 4.6 and once it warms up, I get a ton of valve clatter.
New MAF, new TPS, new air filter, new fuel filter, new plugs...
O2s don't seems to show the greatest, but don't throw codes.
I used a buddies Snap On scanner and after about 45 minutes of scanning stuff we did a self test and it forced a TPS code, so I replaced it. It also hinted at it possibly being the MAF, so I replaced it too.
No change at all.
Once it warms up, it seems to run just fine, but I get so much clatter I'm afraid to hardly hit the throttle.
Also, it gets worse at higher speeds.
I'm lost...
If I had to guess from here, I'd say replace the y-pipe and all O2 sensors... I don't want to do that. It's expensive.
New MAF, new TPS, new air filter, new fuel filter, new plugs...
O2s don't seems to show the greatest, but don't throw codes.
I used a buddies Snap On scanner and after about 45 minutes of scanning stuff we did a self test and it forced a TPS code, so I replaced it. It also hinted at it possibly being the MAF, so I replaced it too.
No change at all.
Once it warms up, it seems to run just fine, but I get so much clatter I'm afraid to hardly hit the throttle.
Also, it gets worse at higher speeds.
I'm lost...
If I had to guess from here, I'd say replace the y-pipe and all O2 sensors... I don't want to do that. It's expensive.
Laughing Gas
Joined: Mar 2002
Posts: 1,060
Likes: 12
From: arizona
There's no way I would spend anymore money on it without having a pro check it out. I rebuilt mine at 385k miles and the rings were carboned up, the valve seals were shot and it was just plain carbon dirty. Tell us how many miles on it.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
If your sure it is valve train noise why would you not think oil starvation?
Your looking at things that have no relation to oil pressure or the valve train.
At that mileage check oil pressure.
When the oil gets up to operating temperature it thins down and pressure drops.
The heads have straining screens. They may be plugged.
A Scanner will do you little good for a low oil pressure issue.
Good luck.
Your looking at things that have no relation to oil pressure or the valve train.
At that mileage check oil pressure.
When the oil gets up to operating temperature it thins down and pressure drops.
The heads have straining screens. They may be plugged.
A Scanner will do you little good for a low oil pressure issue.
Good luck.
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