HELP!!!/Question about the MM Heads

[HorneDogg]

I have recently having a lot of issues with my MM. It will barely run, but prior to that it was running fine. I took it to the shop and the mechanic there find a bullentin with some info regarding the DOHC heads on the passenger side. It says that they sometimes have exhaust valve issues, i have seen a pretty significant decrease in my Vacuum on my boost gage. i am wondering if any one else has heard of this or has had this problem. He is going to perform a leak down test on the head. Compression test turned up 125psi in cylinder 1 on the passenger side and cylinder 3 on the same side was at 155psi. Motor only has 30,000 miles. I could really use some freaking good advice due to the fact this is looking like it is going to cost me out the well you know what plus put me in the dogg house with the wife. HELP PLEASE!

Thanks,

Jamie:beer:

[mtenderenda]

Before I installed my supercharger. I noticed that the car would idle rough, when it was a warm day. Found out that the cylinder head on the drivers side was warping, causing the car to loose compression in the two cylinders, closer to the firewall.
I was able to drop off at a Ford dealership near me. I still had a powertrain warranty on the car. So i only paided a $100 deductable..:beer:

[SC Cheesehead]

Sounds like you've got a vacuum leak somewhere, check out that issue before you start tearing stuff down.

[HorneDogg]

cylinder #1 & #2 are consistently misfiring and the car as absolutly no power. in my cars case, no vacuum leaks have been found, valve cover was removed and springs were visually inspected for any broken or cracked springs and of course we found none. leak test is going to be performed next to see if it is a head gasket. MMR has been contacted in the event that i have to pull the heads they are going to get the Stage 1 Port and Polish, Bronze valve guides and Manley valve springs, if it needs new valves i will more than likely go with some oversized stainless steel. No sense in beating around the bush and doing what needs to be done, just have it all done at one time and get it over with you know.

[MMBLUE]

Before you go nuckin futs, go over on http://www.thechicagogarage.com/forum/marauder-tech/ And reach out to Zack and give him the signs and symtoms. If he can help he will. Zack is the MAN.;)

[03mmmonroe]

cylinder #1 & #2 are consistently misfiring and the car as absolutly no power. in my cars case, no vacuum leaks have been found, valve cover was removed and springs were visually inspected for any broken or cracked springs and of course we found none. leak test is going to be performed next to see if it is a head gasket. MMR has been contacted in the event that i have to pull the heads they are going to get the Stage 1 Port and Polish, Bronze valve guides and Manley valve springs, if it needs new valves i will more than likely go with some oversized stainless steel. No sense in beating around the bush and doing what needs to be done, just have it all done at one time and get it over with you know.

With Cylinder #1,#2 misfiring I would swap coils and look at plugs if your compression test and leak down were ok. I have not had problems with that cylinder head or clylinder 1,2.

[justbob]

^^That or the wiring where it enters the COP cover.

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[Bruce Wayne]

Valve backlash adjusters were installed upside down from the vender to Ford on some of the heads, Ford was aware of this but chose to ignore the bad run of heads

[HorneDogg]

well my car only has 30k miles on it. the COPs were swapped around with no change in the skipping. i actually just replaced the COPs and plugs with Granatelli Hot Street COPs and NGK Iridium Plugs gapped at.035. Replaced the fuel filter and completed the MOD suggested in one of the posts. Completed the PCV valve mod using the Cobra PCV like i read in one of the posts on here. The compression was low in the both cylinder 125psi compared to 155psi in cylinder #3. Never heard anything about the backlash adjusters being installed like that. would that cause a probem like this?

[MyBlackBeasts]

well my car only has 30k miles on it. the COPs were swapped around with no change in the skipping. i actually just replaced the COPs and plugs with Granatelli Hot Street COPs and NGK Iridium Plugs gapped at.035. Replaced the fuel filter and completed the MOD suggested in one of the posts. Completed the PCV valve mod using the Cobra PCV like i read in one of the posts on here. The compression was low in the both cylinder 125psi compared to 155psi in cylinder #3. Never heard anything about the backlash adjusters being installed like that. would that cause a probem like this?

With all the problems Granatelli COP's have caused people, try swapping 2 of the old OEM Ford COPs back in and see what happens. If the 2 G-COPs are bad, causing mis-fire you could have fuel wash of the cylinder walls creating artificial low compression reading. Easy test before jumping in to the big stuff! :D

[HorneDogg]

That's an awesome suggestion MyBlackBeast. I will have that have them do that. I kept all my old OEM COPs when I did the swap. I did swap them back out thinking the same but it actually ran worse and knowing my luck I might have put the old bad ones on the cylinders that were getting fuel washed.

[HorneDogg]

Well I just got a call from the mechanic. After performing the compression test on all the passenger side cylinders #2 dropped 40psi and air could be heard flowing into the intake through the intake valves. Guess I have to remove the heads now. This is going to be a fun job!

[na svt]

Valve backlash adjusters were installed upside down from the vender to Ford on some of the heads, Ford was aware of this but chose to ignore the bad run of heads

How is that even possible?

[na svt]

Well I just got a call from the mechanic. After performing the compression test on all the passenger side cylinders #2 dropped 40psi and air could be heard flowing into the intake through the intake valves. Guess I have to remove the heads now. This is going to be a fun job!
Sounds like you dropped a valve seat which isn't all that uncommon. Porting yoru heads will offer no gains as the intake manifold is the contraint to higher flow. Get a valve job and mill the heads .030" you'll pick up more hp than you would from porting and the cost will be far less. Also, no need for bronze guides if yours are good.

[HorneDogg]

Thanks for the info na svt, I am pretty new to my area in which I live in. I don't know of any machine shops or trust them due to the fact I live in BFE Central Washington. I just thought that I would send them down to MMR due to that fact it seems that they look like the know and do this on a daily basis. I will ask a few co workers that are locals and inquire about any good machine shops around and weigh my options. The factor for me is not money it is just trust in the quality of workmanship.

[na svt]

Thanks for the info na svt, I am pretty new to my area in which I live in. I don't know of any machine shops or trust them due to the fact I live in BFE Central Washington. I just thought that I would send them down to MMR due to that fact it seems that they look like the know and do this on a daily basis. I will ask a few co workers that are locals and inquire about any good machine shops around and weigh my options. The factor for me is not money it is just trust in the quality of workmanship.

The last I knew MMR didn't do their own headwork, they farmed it out to a local guy.

[HorneDogg]

But i bet he has got his stuff down pat though with as many that has probably come through there compared to the machine shops around here that might have seen one or two in the years they have been around.