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02:24:45 - 12/29/2024
Dakota Performance
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William Hiatt
Dodge Dakota
JOIN HERE
9/03/2002
17:24:46
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 Subject: 4.7 HO Cams Questions/Help
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Message:
With the help of Ed Halterman and Jerry we managed to install the cams in
our 4.7's this weekend. Whoever said it is a two hour job can eat me.......
The cams went in good, and it's running smooth, but I do have the following
questions:
1) If I just step on the gas (just punch it a little) I'll get a
rattle/clanking type sound coming from the engine. My father said it's not
pinging/valve clatter, but due to the larger lift and longer duration, it's
just some valve spring noise I'm hearing, which wouldn't hurt anything.
2) Under WOT or a hard acceleration, at around 4000-4500RPM I get a little
"pop" (Which my father says sounds like a misfire). What could be causing
this?
I have a custom flash on the PCM (Timing is at 29 degress) and Autolite
5224's. Should i pull and clean/regap the plugs to help with the misfire?
What about the valve spring noise? I was originally thinking we might've
accidentally moved one of the cam sprokets over a tooth during the install,
but that means that bank would be off on the timing considerably, and the
engine wouldn't be running right..
On the cams, if we're off one tooth, why would it run so well then? I swear
it's the same as it was before, because when Ed & I put them in, I swore we
DIDN'T move the sprockets from the chain. I do remember on both Ed's and
mine that while tightening the sprockets to the cams, the chains DID move,
but both moved together. We had the wedge inserted, could this have caused
problems with the tensioner, causing the need for the base mechanical timing
on the cams to be reset? If it's off a tooth on the chain, could that be
causing the misfire at 4500RPM? It's just one misfire, but it happens every
time.
I've driven about 400 miles on the cams how they are now, and while just
cruising on the freeway, you don't have the noise that I'm describing. I'm
taking it to the dealer tomorrow (Ouch :(!). I'm just going to write this
off as a bad experience, and something happened that I don't know while
installing those cams.
I do remember though on my passenger side head, when putting the new cam in,
at no load, it didn't sit perfectly flush on the head. There was still some
slight play in it (From cylinder 2 to cylinder 8, you could kind of "rock"
it front to back). The old cam did that as well. Is that ok?
Anyone have any other ideas?
Also, the passenger side PCV plastic insert broke when removing it from the
head. I got the rest of it out and plugged the hole with a metal insert.
Could that be causing the problems I'm having?
I also noticed this in the FSM:
"CAUTION: After pulling locking pins out of each tensioner, DO NOT manually
extend the tensioner(s) ratchet. Doing so will over tension the chains,
resulting in noise and/or high timing chain loads."
While this doesn't apply to the cam install, could that be what we're
hearing, timing chain noise? Is the only fix for that to re-setup the timing
chains?
Thanks!
william
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maynardh
Dodge Dakota
JOIN HERE
9/04/2002
12:28:32
|  RE: 4.7 HO Cams Questions/Help
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Message:
Sorry, I've not had any problems with mine after the install. No weird noises or drivability issues after about 2000 miles.
I never noticed either cam having any play in it after installation. However, I did it in less than 2 hours.
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KCDak
GenIII
9/04/2002
13:48:52
| RE: 4.7 HO Cams Questions/Help
IP: Logged
Message:
I am considering upgrading to HO cams as well. How are the performance gains? Also, are you getting any worse gas mileage?
Thanks,
Jason
'00 Sport Quad 4.7L 4x4 3.55, Autolite 3923's, BFG AT T/A,
IAT Adjuster, 360° Air Intakez, Robert Shaw 180° thermostat,
Line-X sprayed bed and nerf bars, Roll-n-Lock tonneau
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