99 ram missfire
#1803640
04/14/15 10:11 PM
04/14/15 10:11 PM
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Joined: May 2006
Posts: 2,046
ky.
kenworth_goose
OP
top fuel
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OP
top fuel
Joined: May 2006
Posts: 2,046
ky.
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I have a 99 ram that has been giving me a little trouble with a misfire. It only does it for 5 minutes or so when I first start it on a cold start. It has new plugs, Mopar wires, cap, rotor, plenum plate and intake gasket, thermostat, etc., etc. The first time I had an issue I found a cracked plug on #8, now I had a misfire on #7. I haven't checked compression yet. I do think I may have an injector issue, 2-3 times I've started it and have smelled gas bad for about 10 seconds. Also has a new map on it. I'd like to find out whats wrong and repair it without throwing a bunch of new parts at it.
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Re: 99 ram missfire
[Re: kenworth_goose]
#1803755
04/14/15 11:31 PM
04/14/15 11:31 PM
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Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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Is it going through coolant? What part of the the plug was cracked? If it's the porcelain around the electrode on the combustion chamber side you are probably looking at a cracked head. You won't pull off a 98 and up mag head that ain't cracked but yours may be bad enough to get coolant in the cylinder causing a miss till it warms up.
392 gen III hemi on E-85 727 trans Dana 60
10.02@134
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Re: 99 ram missfire
[Re: kenworth_goose]
#1803866
04/15/15 12:58 AM
04/15/15 12:58 AM
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Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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The best way to tell if you have a head issue is to put compressed air into the suspect cylinder. Do this with the rocker arms off and the radiator full to the top. With the radiator cap off watch for the radiator level to rise with compressed air applied. If it rises and overflows you have a problem with the head or head gasket.
392 gen III hemi on E-85 727 trans Dana 60
10.02@134
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Re: 99 ram missfire
[Re: kenworth_goose]
#1804001
04/15/15 09:15 AM
04/15/15 09:15 AM
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Joined: Dec 2009
Posts: 20,625
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,625
in a cattle trailer down by th...
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Swap that injector into another hole and see if the miss follows it. Easiest way to check.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: 99 ram missfire
[Re: kenworth_goose]
#1804360
04/15/15 06:54 PM
04/15/15 06:54 PM
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Joined: May 2003
Posts: 3,041
N.W. Florida
Fat_Mike
master
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master
Joined: May 2003
Posts: 3,041
N.W. Florida
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I do think I may have an injector issue, 2-3 times I've started it and have smelled gas bad for about 10 seconds. I had the exact same symptoms on a Mazda; smelled gas and had misfire codes. The cause was bad injector seals. Try what Guitar Jones suggested...
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