Focus Fanatics Forum banner

1 - 10 of 10 Posts

·
Registered
Joined
·
14 Posts
Discussion Starter · #1 ·
2002 Focus. 2.0 Split port SOHC. Automatic.

Getting 3 codes. Misfire cylinder 1, Misfire Cylinder 2, and Bank too Lean.

Assuming too lean is from the misfire, so focusing on the misfire.

Replaced the spark plugs and wires with new, worked for about 10 minutes. Found a vacuum leak from the crankcase breather hose where it plugs into the Throttle body, repaired that and it helped the idle until I drove it. Consistent misfire. Sounds like a Subaru. So now I'm thinking injectors or coil pack. Anything else I should check before those? Because before repairing the vac leak it idled like a cammed car and drove perfect with no misfire, and now it just wont fire proper.

Also using the torque app the TPS signal read 20% at idle. Timing advance at idle jumps all over from 13* to 30*... Which just occurred to me that improper timing advance could cause a misfire as well...

Thoughts?
 

·
Registered
Joined
·
611 Posts
I had a simliar issue with my 98 Escort wagon with the SOHC engine with the same issue having a misfire on both cylinder 1 and 2 with the check engine light flashing (forget if there were other codes). Turned out to be the head gasket that blew an inch and a half long hole between cylinders one and two.

Do a compression check to verify. In my case it showed 0 PSI on both cylinders one and two, low compression (60 psi) on three, and "normal"/ok compression (120 psi) on four. After replacing the head gasket and head all 4 cylinders read around 120 psi. If compression checks good then maybe an issue with the fuel injectors or wiring to them perhaps somehow got damaged, but odd that both 1 and 2 would go bad at the same time.

Probably wouldn't be the coil pack, as cylinder 1 and 4 are shared along with 2 and 3 on the coil pack. Plus the fact it is said to be running lean, faulty spark would result in the car running rich as it wouldn't be burning the fuel off completely.
 

·
Registered
Joined
·
1,212 Posts
Check the coil harness, especially around the plug. I've replaced two that had small cracks and caused misfires.
Easy test...wiggle the harness with the car running. If the misfire gets better or worse, then that's your culprit. Order a new one from Ford, splice it in, and you're good to go.
 

·
Registered
Joined
·
14 Posts
Discussion Starter · #4 ·
update replaced the plugs that have about 1 hour runtime on them.. jet black buildup.. so it's running very rich and reading lean or burning oil. Runs the same.

O2?
 

·
Registered
Joined
·
521 Posts
Grab yourself a compression tester. It's not time consuming and it will tell you a lot about the health of your engine. The SPI was known for head gasket issues, at least in the Escorts.

Toby
 

·
Registered
Joined
·
611 Posts
For compression testers I personally like this http://www.harborfreight.com/quick-connect-compression-tester-95187.html compression tester that Harbor Freight has as it had the fittings that go into the spark plug holes are on rubber houses instead of screw together fittings which can come loose in the spark plug hole. It is also a decent cost at $30 right now and works with the 3 most common spark plug thread sizes.
 

·
Registered
Joined
·
14 Posts
Discussion Starter · #7 ·
I dont think it's compression related right now.. While it runs I smell fuel. Plug #2 is wet, plug #1 is dry. and misfire 1 could be an old code while misfire 2 is a flashing code. I think cyl 2 isnt firing because of a crack in the coil pack.

I'm off to pick up a compression tester..
 

·
Registered
Joined
·
611 Posts
I think cyl 2 isnt firing because of a crack in the coil pack.
Why do you think there is a crack in the coil pack? Is a spark shooting out of one or more of the coil wire towers? If it is then replace the coil pack. I have had that issue happen before, and seen it happen on other cars as well. If you do replace the coil pack be sure to use dielectric grease on each of the terminals.

As for my first reply to your OP, I stated what I did based on the information you gave, missfire on 1 and 2, not on the then unknown information of a potential cracked coil pack.
 

·
Premium Member
Joined
·
21,256 Posts
Wet plug could be an injector that is stuck open. You must have all 3: spark, correct fuel/air mix, and compression to fire. Lack of compression will make plugs wet also.

Keep in mind that if you have been running this car for a long time, you might have destroyed the catalytic converter. Once you find your engine running problem and solve it, then drive for about 10 mins, and look at the cat immediately after you stop the vehicle. If it is glowing bright red hot, then you should replace it. Expect a dull red glow if you're looking at night, but that should be so dull that you almost can't see it is red.
 

·
Registered
Joined
·
14 Posts
Discussion Starter · #10 ·
Replaced coil pack. There were cracks all around the casing, and the mounting hole on the underside was detached. Running a lot better but wife says it still has a flashing engine light.. Grabbing compression tester and checking cat tomorrow. Also will check fuel filter to see if it's fuel starved.
 
1 - 10 of 10 Posts
Top