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Joined: Nov 2002
Posts: 60
CEG\'er
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OP
CEG\'er
Joined: Nov 2002
Posts: 60 |
Well I'm not celebrating yet.. but so far after swapping the coil pack and actually going back to the FMS wires and resetting the PCM the car seems to be running better. It has about 3 maybe 4 miles on it and about 15 minutes of idle time with no CEL's. I pulled a few of the plugs and they seem to be clearing up from carbon fouled to looking half way normal. I am thinking it would probably be a good idea to replace them again now that it seems to be running cleaner. I'll run the car more tomorrow before it gets dark and we'll see how it does.
-Nate
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Joined: Nov 2002
Posts: 60
CEG\'er
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OP
CEG\'er
Joined: Nov 2002
Posts: 60 |
Well so much for no Missfire .. when I run the car above 4k there is no missfire and it runs fine. Any city driving or anything below 4k and it missfires. ??
-Nate
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Joined: Aug 2001
Posts: 5,810
Hard-core CEG'er
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Hard-core CEG'er
Joined: Aug 2001
Posts: 5,810 |
I still fall back on a fully stock ignition with new plugs as a good baseline.
Check the plug and wiring going to the coil packs. Start looking at temperatures too.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Joined: Nov 2002
Posts: 60
CEG\'er
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OP
CEG\'er
Joined: Nov 2002
Posts: 60 |
Just installed fresh plugs, autolight 764's. Gaped to .48 running stock ignition with stock wires. Still having the same issue. Down low the car will missfire.. up high it is fine. Seems to be missfireing because of a rich condition with the car as the plugs still like to foul (Black Carbon) unless I am heavy on the gas over 4k at all times. Found something odd today though. I was looking into the fuel system as a possibility. The car is running around 44psi.. so I know that is ok... BUT when the car is shut back off it drops pressure almost instantly.. and according to the factory service manual it should hold it within 5psi for a minute or so. However, I don't know what would cause the drop.. Time for a new pump? .. New Regulator? Or is it really normal for this.
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Joined: Aug 2001
Posts: 5,810
Hard-core CEG'er
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Hard-core CEG'er
Joined: Aug 2001
Posts: 5,810 |
What year is the car?
99 svt's and older used a regulator. The pressure should stay around 40 when the car is off.
If the pressure is dropping then you could have a bad regulator, or (rare) stuck-open injector.
Definitely something to look at.
Tom
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black
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Joined: Nov 2002
Posts: 60
CEG\'er
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OP
CEG\'er
Joined: Nov 2002
Posts: 60 |
The car is a 98.5 with the return system.
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Joined: May 2000
Posts: 6
Newbie
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Newbie
Joined: May 2000
Posts: 6 |
Did you check the ground strap off the ignition coil...is it making good contact?
98 Contour SE Sport ATX
lightly modded... =0)
14.1 @ 98MPH 1/4 mile!!!
New Version 3.0 inside =0)
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Joined: Nov 2002
Posts: 60
CEG\'er
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OP
CEG\'er
Joined: Nov 2002
Posts: 60 |
Yes, it has good contact.. and is clean of any corrosion. I replaced the reg. last night however it is still doing the same thing.. missfire. I am going to check the fuel pressure again to see where it's at this time. The fuel pressure yesterday was around 45psi however would drop to about 10psi within 30 seconds of shutting the car off. According to the Factory Service manual it should stay within 5psi of the original 45. This has to be the most annoying problem I've ever had.. it's the last thing I need to take care of in order to start driving the car again.. and the weather is starting to get really nice.. grr.
-Nate
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Joined: Nov 2002
Posts: 60
CEG\'er
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OP
CEG\'er
Joined: Nov 2002
Posts: 60 |
hmm.. well.. after replacing the regulator the plugs are comming out clean.. completely clean.. I'm guessing that my reg. was the problem with the carbon fouling.. and I'm also guessing that now the reason for the missfire is the lack of MIL eliminators causing a lean condition being that I have no pre-cats. .. Anyone know if this sounds right? .. It's my only guess.
-Nate
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Joined: May 2000
Posts: 21,197
I have no life
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I have no life
Joined: May 2000
Posts: 21,197 |
I would defantely get some MILS on there.
-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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