bigdreynolds

Ok , So I bought a 1999 F150 4x4 with a 4.6 and automatic transmission . I bought it with no keys (guys ex took keys out of spite ) was told it just needed a fuel pump .
So I replaced :
fuel pump
PATS module , instrument panel, key and tumbler and computer (have done this many times on other trucks )
Truck will now start and run but .... codes
p0755 shift solenoid B
p0354 ignition coil D primary/secondary circuit
p0355 " " E " "
p0356 F
p0358 H
Then after a while p0705 transmission range sensor c showed up .
I have the 4.6 with the 2 coil packs in the front not individual COP's .
The injectors on those cylinders get injector pulse for about 10 seconds after start up then very erratic if any after that .
I've switched coil packs out with others , injectors , complete PATS setup (twice) checked all the wiring , unplugged all 4 O2 sensors , checked compression ( 185-190 on all 8 ) , swapped out almost every sensor including cam sensor , IAC, MAF .

The computer and everything that I put in it came out of a truck that had cops and this one has the two coil packs in the front and I'm thinking that might be my problem.

So since coils are paired on the 4.6 with the 2 coil packs is the computer not firing the paired cylinders ?

I have another computer , pats module and key and tumbler from a 2 coil setup on a 98 expedition but the cluster is not digital so plugs are different . will it work with old cluster ?

formerjeepguy

I would have left the modules and PCM alone and just used Forscan and a cheap ELM 327 adapter to program some new keys. You have no way of knowing that the computer is completely compatible with that truck.

bigdreynolds

Problem is that they already destroyed the tumbler .

formerjeepguy

So install a new ignition lock and then program in the new keys. There is no need to swap out all those extra parts. Look at www.forscan.org to get the free application and instructions for using it. Go to amazon to get a cheap $20 elm327 usb adapter. When you are done you will wonder why you ever went to so much trouble for such a simple thing.

BareBonesXL

There's another guy who was posting recently about a similar issue. COPs PCM with coil packs. I don't think that he ever said if he fixed it.

A coil pack PCM "fires" one wire to two plugs twice as many times, instead of a COPs PCM which fires one wire to a single plug. So your COPs PCM shouldn't be matched with your wiring harness. It will/should have COPs pins connected to nothing, if it's using the COPs protocol for ignition.

Found it - https://www.f150forum.com/f12/puzzli...1-f150-498656/

Bluegrass

Come on now! On 4.6 two coil pack, all cylinders are fired separately.
Only a V6 fires two cylinders as pairs. one on compression, the other when that cylinder is in it's Exhaust stroke where is does nothing but completes the circuit coil secondary for the other.
The polarities are opposite on each pair set of cylinders.
The original plugs for these v6 motors also specify 3 plug identity for 3 cylinder cylinders of the pair because of the polarity difference vs electrode wear.

BareBonesXL

You're saying that the "coil pack" for the 4.6 is not wasted spark? It works like COP but the individual coils are ganged in to a "pack"? I'm asking, I don't know. Chevy does coil-by-plug. But I didn't know that Ford grouped their individual coils like that and fired them like a COP system.

Certainly possible and would work just fine. I had assumed a coil pack was always wasted spark.

My 2000 workshop manual shows COP for the 4.6. So 99 would be the last year for ganged coils.

BareBonesXL

Not trying to offend or argue. Thought I had learned something new, which would be a reasonable thing on the progression from wasted spark to COP.

But a look at the coil packs for a 99 4.6 shows only three pins. You can't control four coils and cylinders with three pins, unless it's wasted spark. Only looked further 'cause I like a good puzzle.

https://www.rockauto.com/en/catalog/...tion+coil,7060

https://www.rockauto.com/en/moreinfo...t=7060&jsn=552

https://www.rockauto.com/en/moreinfo...t=7060&jsn=545

Jbrew

Maybe it was suppose to be. 2000's were a mix, some 4six's got packs, others COP. As said, by 01 both v8's were COP. By 01 the 4six's were also PI.

bigdreynolds

So the question is whether the COP computer is the problem or not ?

Also does the PATS use the instrument cluster or not on this truck since it has a separate PATS module under dash behind emergency brake ?