yawr250f,

With that much common sense, and knowledge I'm surprised they can't get the voting problem fix'ed in Ohio!
And you explained it so well.

Keep up the good work!

Gene

 

You have to understand how a misfire is detected. The PCM monitors the speed of rotation and acceleration using the crankshaft position sensor. When it sees a change in speed or acceleration that it doesn't like it assumes that a misfire occurred. The PCM then sets a code and lights up the SES light or flashes it depending on how bad the miss is. Basically 3 things can cause a misfire. No spark, no fuel or mechanical problems. Because your symptoms occurred at the same time as a noise I would suspect a mechanical problem. But it would be prudent to eliminate spark and fuel first. As you have a new plug it can be eliminated as the cause. Buy or borrow a spark tester and check the coil. If it tests ok then spark is eliminated. Now you have to check fuel. The first test is pressure. Should be 30-40 psi at idle. Attach a gauge to the schrader valve and check it. It should hold it for at least a minute when you first turn the key to on. If it doesn’t it could be the regulator or a leaky injector(s). Suspect the 1 and 6 injectors first. Have them tested. If the pressure checks out you need to test the injector circuit. There are lights available that plug into the connector and flash when the injector is pulsed. If that checks out then the injector needs to be checked. The only way to check an injector is to have it tested at a shop. If you have a good spare throw it on and see if ti cures the miss. Sooooo, if Spark and fuel check out you are left with mechanical problems. Where to start? Look for vacuum leaks first. Check out everything between the air filter and the intake manifold. A gas or propane test will spot it fast. If that checks out then it is time to pull the cam/valve cover. Look for broken springs bent valves loose or damaged roller followers etc.... Because you has cylinder specific codes it should show up those cylinders only.

Regards

Jean Marc Chartier

EDIT: spelling

 

The GM factory scan tool has an injector pressure drop test that will pulse the injectors one at a time while you watch a fuel pressure gage for the number of PSI dropped. Your Ford dealer probably has the same capability.

 

The condition of the spark plugs on #1 and #6 were black and full of carbon. It looks like they were not firing at all. Where the other plugs the electrodes were worn but the color of the plugs were normal (brown).

 

Those aren't the symptoms the mechanic described for a cracked intake manifold. Glad you found it, did that clear up your problem?

 

I don't know if this is any help to all of you. I have been doing some research for cylinder head oil leaks on the 1998-2001 4.6L and 5.4L engines built in the Romeo Plants and Windsor Plants. The number of vehicles involved is in the 1,000's.

I found a Ford powerpoint presentation dated Aug, 2003. The presentation is for the commercial vehicle sector, but sounds like something that may fit your description. Here is the contents on the page of the document that may fit your problems. You may ask about whether they have extended the Customer Satisfaction Program to consumers. Good luck if this helps.

Cracked Intake Manifold Failures
1999-2001 CVPI
- Cracked intake manifolds and thermostat housings
- ONP 01M02 covers certain 1996-2001 CVPI
- 2002 Aluminum crossover (*means they now use)
- Customer Satisfaction Coverage for 7 years/unlimited miles

i

 

Well I just took the truck to ford and paid $160.00 to have it looked at. The results are no good. I got a misfire on #1 & #6 again due to valve problems he says. From what he could tell and the readings he got. I only have 20 psi on #1, and #3 has low compression too, as well as #6. Great news ONLY!! $2000-$4000.00 to fix it.

 

Known issue by Ford. I have seen allot of posts on this site about plugs shooting out or cracking and problems related to misfires. This may pertain to that and affect all models produced from 1999-2002. This is from Ford.

Lean Engine Issues (Valves/Plugs/Heads Crack)
1999-2002 MY

- Root cause is lean air/fuel mixture
- SSM 12118 (fuel pressure)
- ***Change Fuel Filters Regularly***
- TSB 00-10-03 - Reprogram PCM/Software octane adjustment
- Check mass air flow sensor (TSB 98-23-10)
- Check area between A/C condensor and radiator
- Check high and low speed cooling fan operation
- Causal factor must be addressed before engine replacement

 

Can an aluminum intake from my 98 parts rig go on my 2000 with a plastic intake?

 

Holy thread resurrection!

If they are both 5.4's, nope. 98 is non-PI and 2000 is PI. If they are both 4.6's I *think* so. If one is a 4.6 and the other a 5.4, nope.

 

I will second that. Very surprised to get an email update on this one. On all the forums I've been on, I don't think I've ever seen anything close to a 10 year.

I also can't believe I remembered my password.