Cold rough idle, misfires until warm
#21
08-02-2011, 01:30 PM
Champion
#22
08-02-2011, 01:30 PM
#23
08-02-2011, 01:43 PM
Champion
#24
08-06-2011, 06:02 PM
#25
08-06-2011, 06:15 PM
Legend
#26
07-19-2020, 05:57 PM
Ok I have a bit of a problem that just came up. 99 Ram 1500 3.9L
Yesterday morning I got in the truck and it was running bad. Misfiring, popping through the exhaust and idling real rough. After about 10-15 minutes it smoothed out and ran fine the rest of the day. So I immediately thought cap & rotor (even though I had replaced them both not more than 1 1/2 years ago). Yesterday evening I replaced both and asked the wife how the truck was doing and she said fine. I took it out for a drive afterwards and no problems at all. This morning I start the truck up and it is doing the exact same thing. Any ideas where to start looking next?
Yesterday morning I got in the truck and it was running bad. Misfiring, popping through the exhaust and idling real rough. After about 10-15 minutes it smoothed out and ran fine the rest of the day. So I immediately thought cap & rotor (even though I had replaced them both not more than 1 1/2 years ago). Yesterday evening I replaced both and asked the wife how the truck was doing and she said fine. I took it out for a drive afterwards and no problems at all. This morning I start the truck up and it is doing the exact same thing. Any ideas where to start looking next?
#27
07-20-2020, 08:46 AM
#28
07-22-2020, 01:53 AM
Fast way to check for plenum leak is to take off the breather hose going to you air cleaner over the intake....When running at idle a plenum leak will cause a huge amount of vacuum at the end of that hose. Normally there is only slight detectable vacuum there. You will know what I am talking about if you check it..it is very obvious.