Question about 1992 Dodge Dakota
When I try to start my truck sometimes it starts fine but other times it will rev up and then die. Other times it will start and idle but it is rough and when I push the accelerator the RPM will not go above 2000 and it misses and backfires. When it runs it runs good but sometimes I will be driving and it will start to miss and spit and sputter and backfire. I have replaced the plugs, wires, ignition switch, ignition roter, distributor cap.
If anyone can help me with this I would greatly appreciate it.
The first thing you need is to have the unit scanned. Check things like the baro sensor,map sensor,coolant temp. and the TP sensor.Also check your fuel pressure,volume and injector spray pattern. I think you will have found your problem,but if not hit me back with engine size and any codes,Good Luck.
Posted on Aug 25, 2008
SOURCE: starting and running problem
Breaking up like you described can be related to a condition where the distributor drive gear is wearing out.
Had you checked it for rotor tip travel (about 5mm of loose travel is the max) or had the distributor indexed? The indexing procedure appears to be similar to an ignition timing adjustment but isn't the same.
Chrysler TSB 18-08-93 Rev A describes a condition often seen on the 1992-1993 3.9 engine. The distributor drive gear wears out prematurely and then wallows out the support bushing in the engine block. Your oil pump is driven by the same gear through the distributor shaft, so cold engine operation often is worse from the higher viscosity of the oil and the resulting load it places on the worn parts.
The distributor index slips to the retarded zone (trails what it should be) just from the gear wear. Adding in the worn bushing and chain stretch can put the distributor in a position where ignition cross-firing can occur and the switch plate (cam sensor) within the distributor can drop out-of-sync with the crank sensor.
If you haven't done so, check this out for me. Remove the distributor cap and twist the rotor clockwise and counter-clockwise. The total tip travel should not exceed 5mm, which is just about 1/8". Even if it exceeds this, an adjustment/ indexing of the distributor will get it running right again if only for a short while.
Posted on Mar 11, 2009
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