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Old 08-20-2005, 19:01   #1 (permalink)
dmac
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knock sensor location 97 crown vic 4.6

I recently had to replace the intake on my 97 crown vic. while doing that I noticed there was NO knock sensor in the valley. there was a spot that looked like it should be machined out to have one, but nothing there. also were no wires leading into the valley, I was concerned that it might be in the rear of valley so I looked for wires. only thing there was the coolant tube and there was nothing under that also.

My question is where else would it be, the dealer I bought it off (Ford) could not find any manual reference stating any other location for it.


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Old 08-20-2005, 22:01   #2 (permalink)
Happy Traveler
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Re: knock sensor location 97 crown vic 4.6

To the best of my knowledge, there is no knock sensor in the 97 CV; at least
not in the civilian version.


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Old 08-21-2005, 01:01   #3 (permalink)
Shoe Salesman
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Re: knock sensor location 97 crown vic 4.6


"dmac" <dmacleo@midmaine1.com> wrote in message news:1124586188_351@spool6-east.superfeed.net...
I recently had to replace the intake on my 97 crown vic. while doing that I noticed there was NO knock sensor in the valley. there was a spot that looked like it should be machined out to have one, but nothing there. also were no wires leading into the valley, I was concerned that it might be in the rear of valley so I looked for wires. only thing there was the coolant tube and there was nothing under that also.

My question is where else would it be, the dealer I bought it off (Ford) could not find any manual reference stating any other location for it.


--
Dave MacLeod
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dmacleo@midmaine1.com

Is it pinging/knocking? If so clean the MAF and change the fuel filter. If not, you worry to much :)
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Old 08-21-2005, 11:02   #4 (permalink)
dmac
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Re: knock sensor location 97 crown vic 4.6

I was wondering if this was the case. thanks


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"Happy Traveler" <happy_traveler@abc.net> wrote in message
news:Y96dnQhA5_VhnJXeRVn-gg@comcast.com...
> To the best of my knowledge, there is no knock sensor in the 97 CV; at
> least
> not in the civilian version.
>
>




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Old 08-21-2005, 11:02   #5 (permalink)
dmac
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Re: knock sensor location 97 crown vic 4.6

I am getting spark knock. cleaning MAF did not help. ECT, ACT, EGR, Fuel pressure all good. I will try colder plug next, hot and humid weather is the worst and gas grade makes little difference.
thanks


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Dave MacLeod
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dmacleo@midmaine1.com
"Shoe Salesman" <someone@microsoft.com> wrote in message news:wYVNe.5034$UE2.2531@tornado.socal.rr.com...

"dmac" <dmacleo@midmaine1.com> wrote in message news:1124586188_351@spool6-east.superfeed.net...
I recently had to replace the intake on my 97 crown vic. while doing that I noticed there was NO knock sensor in the valley. there was a spot that looked like it should be machined out to have one, but nothing there. also were no wires leading into the valley, I was concerned that it might be in the rear of valley so I looked for wires. only thing there was the coolant tube and there was nothing under that also.

My question is where else would it be, the dealer I bought it off (Ford) could not find any manual reference stating any other location for it.


--
Dave MacLeod
remove the "1" to reply
dmacleo@midmaine1.com

Is it pinging/knocking? If so clean the MAF and change the fuel filter. If not, you worry to much :)
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Old 08-21-2005, 15:01   #6 (permalink)
Paul of Dayton
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Re: knock sensor location 97 crown vic 4.6

I've been getting spark knock on my '95 and have done all the usual things,
like you. I am beginning to think my belt drive radiator fan (this car has
both electric and belt driven) has a bad clutch. I never hear the fan roar
anymore and the outdoor temp gauge used to be stable, now it changes a lot
depending moving or stopped for a lite. It is most noticeable when the car
is warmed up. Water temp gauge never goes above half, but I am not sure it
is linear.

Good luck! Let us know what fixes it, please!

PoD




"dmac" <dmacleo@midmaine1.com> wrote in message
news:1124645781_111@spool6-east.superfeed.net...
I am getting spark knock. cleaning MAF did not help. ECT, ACT, EGR, Fuel
pressure all good. I will try colder plug next, hot and humid weather is the
worst and gas grade makes little difference.
thanks


--
Dave MacLeod
remove the "1" to reply
dmacleo@midmaine1.com
"Shoe Salesman" <someone@microsoft.com> wrote in message
news:wYVNe.5034$UE2.2531@tornado.socal.rr.com...

"dmac" <dmacleo@midmaine1.com> wrote in message
news:1124586188_351@spool6-east.superfeed.net...
I recently had to replace the intake on my 97 crown vic. while doing that I
noticed there was NO knock sensor in the valley. there was a spot that
looked like it should be machined out to have one, but nothing there. also
were no wires leading into the valley, I was concerned that it might be in
the rear of valley so I looked for wires. only thing there was the coolant
tube and there was nothing under that also.

My question is where else would it be, the dealer I bought it off (Ford)
could not find any manual reference stating any other location for it.


--
Dave MacLeod
remove the "1" to reply
dmacleo@midmaine1.com

Is it pinging/knocking? If so clean the MAF and change the fuel filter. If
not, you worry to much :)


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Old 08-21-2005, 15:01   #7 (permalink)
Backyard Mechanic
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Re: knock sensor location 97 crown vic 4.6

"dmac" <dmacleo@midmaine1.com> wrote in
news:1124645781_111@spool6-east.superfeed.net:

> I am getting spark knock. cleaning MAF did not help. ECT, ACT, EGR,
> Fuel pressure all good. I will try colder plug next, hot and humid
> weather is the worst and gas grade makes little difference. thanks
>
>


The colder plug might help.. but...Sounds a lot like Combustion chamber
carbon buildup to me...

Do you ever let that horsie run? Or do you always drive it conservatively?

And what brand of gas do you use?

You might ask your local law enforcement person if they have that problem
and what brand they use.
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Old 08-24-2005, 11:01   #8 (permalink)
dmac
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FIXED-Re: knock sensor location 97 crown vic 4.6

replacing MAF fixed it. tried cleaning again yesterday and got better
results that lasted 1 day. so I replaced it today, no knock, more power, and
I expect it will slightly help mileage.

as far as gas, all brands and grades were doing it and this horsie runs a
lot. that's why I was so concerned about the knock. the knock started about
a year after I got the vehicle so I had a baseline to work from there.
when I had replaced intake I checked egr passages on old manifold and they
were clean, so of course new one was. I used that to rule out the egr
system. I changed plugs about 3 months ago and even with 50K on them
(original per previous (initial) owner) so I had to guess (correctly
luckily) that chamber was not in to bad shape as far as carbon. previous
owner also got into it at least once a week. I had checked with the dealer
that services local sheriff vehicles, they are all 99 and up and had knock
sensors, I figured I could not use anything from them as a baseline.

I had suspected MAF was the problem but I needed to rule out the other 5 or
6 systems that could also affect this, the biggest obstacle was determining
if it was supposed to have the knock sensor or not.

Thanks all


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Dave MacLeod
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dmacleo@midmaine1.com
"Backyard Mechanic" <pettyfog@yaywho.com> wrote in message
news:Xns96B9A88EC2E5Bpettyfogery@207.115.63.158...
> "dmac" <dmacleo@midmaine1.com> wrote in
> news:1124645781_111@spool6-east.superfeed.net:
>
>> I am getting spark knock. cleaning MAF did not help. ECT, ACT, EGR,
>> Fuel pressure all good. I will try colder plug next, hot and humid
>> weather is the worst and gas grade makes little difference. thanks
>>
>>

>
> The colder plug might help.. but...Sounds a lot like Combustion chamber
> carbon buildup to me...
>
> Do you ever let that horsie run? Or do you always drive it
> conservatively?
>
> And what brand of gas do you use?
>
> You might ask your local law enforcement person if they have that problem
> and what brand they use.




----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
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----= East and West-Coast Server Farms - Total Privacy via Encryption =----
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Old 08-24-2005, 11:01   #9 (permalink)
dmac
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Re: knock sensor location 97 crown vic 4.6

I'm not sure, but I would think that might affect it due to heat on the
front intake runner. no matter what it probably should be fixed though. I
also have belt driven as well as electric for the AC. let it idle for about
1/2 hr and fan should turn on during that time, I had to do it this way
because I was never able to hear the fan, I do mostly interstate driving.

did you also check fuel pressure and pressure regulator? I have been told
its one of the items commonly overlooked when diagnosing this issue.

I double checked mine today before buying the new MAF and key on engine off
pressure was 35psi, key on engine running at idle was 30psi and open
throttle while running was 40psi. disconnecting pressure regulator at idle
was 40psi and did bog the engine slightly. also tested pump check valve,
turn key on, waited 10 seconds, then key off and it held the 35psi for 30
minutes with no drop.


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Dave MacLeod
remove the "1" to reply
dmacleo@midmaine1.com
"Paul of Dayton" <F_and_P@NOSPAMameritech.net> wrote in message
news:115Oe.367$eQ.364@newssvr30.news.prodigy.com...
> I've been getting spark knock on my '95 and have done all the usual
> things, like you. I am beginning to think my belt drive radiator fan
> (this car has both electric and belt driven) has a bad clutch. I never
> hear the fan roar anymore and the outdoor temp gauge used to be stable,
> now it changes a lot depending moving or stopped for a lite. It is most
> noticeable when the car is warmed up. Water temp gauge never goes above
> half, but I am not sure it is linear.
>
> Good luck! Let us know what fixes it, please!
>
> PoD
>
>
>
>
> "dmac" <dmacleo@midmaine1.com> wrote in message
> news:1124645781_111@spool6-east.superfeed.net...
> I am getting spark knock. cleaning MAF did not help. ECT, ACT, EGR, Fuel
> pressure all good. I will try colder plug next, hot and humid weather is
> the worst and gas grade makes little difference.
> thanks
>
>
> --
> Dave MacLeod
> remove the "1" to reply
> dmacleo@midmaine1.com
> "Shoe Salesman" <someone@microsoft.com> wrote in message
> news:wYVNe.5034$UE2.2531@tornado.socal.rr.com...
>
> "dmac" <dmacleo@midmaine1.com> wrote in message
> news:1124586188_351@spool6-east.superfeed.net...
> I recently had to replace the intake on my 97 crown vic. while doing that
> I noticed there was NO knock sensor in the valley. there was a spot that
> looked like it should be machined out to have one, but nothing there. also
> were no wires leading into the valley, I was concerned that it might be in
> the rear of valley so I looked for wires. only thing there was the coolant
> tube and there was nothing under that also.
>
> My question is where else would it be, the dealer I bought it off (Ford)
> could not find any manual reference stating any other location for it.
>
>
> --
> Dave MacLeod
> remove the "1" to reply
> dmacleo@midmaine1.com
>
> Is it pinging/knocking? If so clean the MAF and change the fuel filter. If
> not, you worry to much :)
>
>




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----= East and West-Coast Server Farms - Total Privacy via Encryption =----
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Old 08-24-2005, 17:01   #10 (permalink)
Paul of Dayton
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Re: FIXED-Re: knock sensor location 97 crown vic 4.6

Thanks for the repair report. Everyone around here appreciates it as much
as I do.

I do plan to replace the fan clutch, I just need to wait a bit. The
electric runs as soon as I turn the A/C on so it is working right.

I disconnected the electric a few weeks ago on a hot day for a test. I made
an in-town stop-and-go driving run (lot's of stop - untimed traffic lights)
and just really tried to heat it up. The fan never made much noise and the
temp guage never went up above center. The clutch drag is the same if hot
or cold, sat overnight or fresh off a hot drive. I'm fairly sure it's shot.

If I can't make the knock go away with the clutch, then it's time for a new
MAF. I've done all the rest already. Your report tells me there sometimes
is a difference between cleaning and replacing.

Thanks!

PoD



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