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check engine flashing and studdering

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  #1  
Old 06-13-2013, 07:09 AM
DoubleL24
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Default check engine flashing and studdering

i have a 99 ram 1500 with 5.9. i dnt drive my truck much during the week and this morning around 40mph it was studdering and the check engine light started flashing then shut off. anyone have any ideas why this is occuring?
 
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Old 06-13-2013, 07:38 AM
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Sounds like a misfire. If there's any codes to read a scanner would tell you what cylinder(s) are misfiring.

I'd start with the #8 plug, and check them one by one.
 
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Old 06-13-2013, 08:26 AM
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Can you do the key trick on the 99 to read codes? If so, give that a run, and see what you get. (a selection of P03XX codes would be my guess.....)

Have you had a look at your plenum yet? Probably blown....
 
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Old 06-13-2013, 09:34 AM
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I'm thinking you can on '99, is it '98 that's weird?
 
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Old 06-13-2013, 09:46 AM
DoubleL24
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how do you do the key trick? I replaced the plenum bout year and a half or so ago.
 
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Old 06-13-2013, 09:59 AM
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Originally Posted by DoubleL24 View Post
how do you do the key trick? I replaced the plenum bout year and a half or so ago.
Key on-off on-off on watch the odometer.

How did you replace the plenum? Do anything with the Cat and Pre-Cat O2 sensor yet?
 

Last edited by stewie01; 06-13-2013 at 10:02 AM. Reason: wrong info
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Old 06-13-2013, 10:00 AM
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If it stutters and the CEL is flashing, not only is there a misfire, but I'm betting a plug wire (or more) is/are making contact with an exhaust manifold. When that happens, the insulation melts, causing the outer mesh sheath to make contact and thus grounds the corresponding plug & coil.

Pop the hood and check all plug wires first. Been there, done that.
 
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Old 06-13-2013, 10:00 AM
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Turn the key on, off, on, off, on. Read codes on the digital odometer.

When is the last time you change plugs/wires/cap/rotor?
 
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Old 06-13-2013, 10:22 AM
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I'm thinking clogged cat. Try unscrewing the precat o2 and see how it runs.
 
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Old 06-13-2013, 10:27 AM
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OP, listen to these guys. Before I even read the replies, I knew what to check and these guys already pointed it out.


Key dance trick is 99+ key on/off 3 times with leaving it key on at the end.
 
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