1996 SHO Rose Mist - Code For 3 Misfires

[mrecoolgar]

I've delayed asking for help long enough.
Car still runs but very badly and rough.
Have codes: P0305: Cylinder 5 misfire, P0306: Cylinder 6 misfire, P0308: Cylinder 8 misfire and P1519: which I believe is a runner control stuck closed.
Seems odd that I have 3 misfires at the same time.
I was thinking maybe an electrical connector came apart partially or completely.
The cams are welded and the car ran great, good power, smooth and quiet.
Any help is appreciated.
My new wife likes the car and I'd like to keep it for a while.

 

[sperold]

Start moving coils around and see if misfires follow the move to the new location.

There are circumstances where a number of coils can fail at the same time due to one issue.

 

[SHOdded]

All on the front bank, how rare is that! Congrats btw, Kevin!

 

[GEN 3 SHO FAN]

1) It can be oil in spark plug wells.

I have random misfires with no codes from front bank because I changed spark plug well gaskets (rubber rings) on rear bank only because of the heat there (and because they are 8$ each...) when I welded my cams 2 years ago. However some time after, age does it job and the front gaskets start to leak on plugs and coils after I opened the valve cover to weld the cams. This prob apeared very slowly but getting worst with time. Take me 2 summers to found what was going on with finally a P0305 code. (Cylinder #5 had many, #6 had a good quantity too, #7 had some traces and #8 had almost nothing)

I must say that when I weld my cams, I changed the 2 valve cover gaskets but not the front plug well gaskets, maybe the tickness wasn't the same between old and new gasket. These gaskets with time became like hard plastic... Guys in shop here (you know already that probably) say me that oil is absorbed by the ceramic part of the plug and causing some internal ground. We cannot just clean a plug and put it in place again...

2) Watch also a small (ground ?) wire starting from injector #5 (seems factory made) and going thru the runners and under the TB to the firewall on driver side. Some time after I rebolted my motor to weld it, watching if all was rebolted correctly, I saw this small wire sticked on EGR valve tube and badly toasted... I used a screwdriver to retreive from it and put a better protection it with electrical tape too. Not sure for what purpose it serves however...

Just my 2 cents.

 

[mrecoolgar]

Thank you sperold.
Thank you SHOdded. And yes your old 95 ATX will live once again.
Thank you GEN 3 SHO FAN.

 

[SHOdded]

Great to hear, Kevin

 

[GEN 3 SHO FAN]

Keep us informed maybe it's another thing...

 

[mrecoolgar]

Wow, it's almost been two years.
Anyways... I decided to remove the front cam cover.
I discovered weld failure on the exhaust cam.
Intake valves are available but not exhaust valves.

 

[SHOdded]

Might have to get our Russian friend on the case and find us some exhaust valves to go along with the main bearings

What are your plans then for Rose?

 

[stephen newberg]

Do you know who did the welding?

pax, smn

 

[luigisho]

Try salvage yards on the interwebs for heads/engines? Maybe Dan in Pittsburgh has one around?

 

[mrecoolgar]

Thanks guys.
I haven't visited the salvage yards for many years.
I guess I'll be going on a warmer day.
Dan is searching his inventory now.
It was a friend of a friend who did the welding.
He was a military welder.
I see it as a fluke that the weld failed and I will have all the cams rewelded.
I guess Ill keep it for a while, maybe until it goes antique and I can take it to Fall Hershey.

 

[luigisho]

There are salvage bots on the internet that will search chunks of different salvage yards that belong to the service that will help you track down harder to find parts easier.

Try salvage yard search engine on google or something like that. A bunch of options will pop up and then you contact them to hopefully figure out if it is non failed cam head. I looked on car-part.com and some listings listed failed cam on some of the listings.

 

[SHOdded]

car-part.com I don't think rearcounter.com will have anything to offer, but why not LOL.

 

[E1]

We could help each other quite a bit here.

I have a car in the driveway with a good running welded motor. I'm moving to another state. I need to get rid of this car, not take it with.

Bring a trailer and I'll GIVE it to you for $350.00

I'm in the Western Chicago Suburbs - I-355 and I-88.

 

[SHOdded]