i have a 98 ranger 4 cylinder with 2 coils when it rains out the truck misfires and even stops running iv changed all 8 plugs and wires also both coils still have the same problen when it gets wet runs really ruff and will even die. any ideas what to check next. what are the components that could be causing this problem for me thanks for any kinda ideas where to look

 

Welcome to FTE!!!!

Did you put dielectric grease in all the wire boots? Also check all the connections at the coils for water intrusion.

 

yes grease on boots and coils and electrical connections on coils and powertrain control module

 

they sell a little tune up kit at kragen that has a small thing of anti seize for the spark plug threads and a small bottle of di-electric for you boots. it's liks $3-4.

 

runs great when dry just when wet out i did grease with dielectric new plugs wires and coils still same problem

 

If this problem began AFTER you changed the plugs & wires, pull & check the plugs ceramic insulator's for damage, like crackes or chips.

Also check the wires insulation & routing, just beause they're new, doesn't automatically make them good!!!

Alsp try cleaning & spraying the coil pack with silicone, but don't do this with the engine running, because if it's ingested by the engine, it won't do the O2 sensors any good.

If that fixes or changes the problem for the better. you probably have a coilpack encapsulate problem, like a crack or air bubble close to the suface.

Let us know what you find.

 

this problem was why i changed thess parts still had same problem so plugs wires and coils are ruled out. do i need to change the powertrain control module ? or can crankcase position sensore or what im going nuts cant drive my truck cause its so wet out also seem to get really bad going up a hill it will stop running alltogether. have to get running and hold throtle half till fires on all four then soon as i try to go misses again seem to miss worst when i turn the wheel or any kinda load on the engine keep in mind when its dry out truck runs good

 

The PCM should be picking up the miss fire, try getting the codes pulled, some parts stores will do it for free if you don't have a scanner.

 

im not getting any codes have noticed thou that when the truck has less than 1/4 tank of gas it runs really bad when i get up to half a tank it runs much better still has a mis thou any ideas why this is ?

 

Couldn't hurt to test the fuel pressure with an almost empty gas tank.

 

truck ran great today finally dried out. so i took a hose the the engine compartment didnt change anything still ran good. came back 1 hr later truck was undriveable missing like crazy check engine light flashing was pulling injector wire off one at a time ang #4 cyl had no power pulled plug wires off one at a time and they all are fireing with good spark. im thinking now its fuel injectors is this my problem ? 168K miles 2.5 engine. iv changed the fuel pump assembly now with no change. to hard to get to the injectors to do an ohm test

 

If the CEL was flashing you should have gotten codes but you may have created false codes by pulling the injector wires. Try reading then clearing them and do the same test and rereading the codes.

 

i had the same problem. after it rained me ride would not start or would run real bad. i did everything. even got stuck when it rained when we went camping. anyways try this it fixed mine. replace the ckp sensor.