Engine Mechanical problem
1990 Ford F150 V8 Two Wheel Drive Automatic 102501 miles
I have a 5.0 1990. It started having a bad miss about 6 months ago. I changed the plugs, wires, cap, rotor, coil with no change.
What it does is when starting cold it seems to run OK. I can start off and after about a mile to mile and half it then seems to start have a miss almost like a dead cylinder or something. It does not miss under full pedal and also if I keep the rpm above 2200-2400. It has now started to spark knock a little and lose power when going up hill even with the RPM up.
I thought it may be the trans as it seems to miss or maybe it was the converter bumping or something as it seemed to happen when the trans would go into OD.
I took to trans shop and they said the trans seemed fine but it had a miss.
Someone said maybe a ignition module or something.
In a nut shell if you are going down road after warmed up when it goes into OD with any kind of pull at all it starts a bad missing/jumping like motion. Only does this under load. Even when warm it runs smooth (mostly as it does have alot of miles). Is has a slight miss when reving up up but the bad miss is when driving under load, makes the truck actually bouch like with real bad vibration like in motor/trans area.
It has to be something that changes after warming up.
Saturday, May 2nd, 2009 AT 9:31 AM