truck hates water...??

[alteredraptor]

87 4runner, so not entirely too sure why, but my truck doesn't like when it's raining... this is an ongoing issue I've been having. whenever it's rains, and I go drive somewhere, both my timing and idle will change and my truck runs rough, next day with no rain, it'll run just fine without a problem. any ideas as to where to start to look?

 

[raevenzero]

There are some places in the wire harness that control the injectors that may be shorting. Re-soldering and sealing these can help.

Also, you may have a leak in the passenger front fender well allowing water to enter and soak your computer. Check that out as well.

 

[alteredraptor]

well the injector connections have been soldered up and sealed about two year ago, I'll have to check the check out the fender for leaks

 

[raevenzero]

I ended up relocating mine to the glove box due to water issues.

 

[ferg]

Your fresh air intake is under the cowling just to the right of the glove box. Also check to see if the grommet/gasket around the ECU going through the firewall is in good shape.

Every time I wash the engine compartment mine has issues.

 

[alteredraptor]

well I do know, that grommet is bad, jut find it weird since there's no sign of water there, I can something's up even before I get out my driveway

 

[raevenzero]

Maybe condensation in the dizzy or coil?

 

[alteredraptor]

how would condensation get in coil? I can understand the dizzy getting it, but not a coil...

 

[raevenzero]

Heat cycles can cause small cracks that can let moisture. I haven't heard of it on a truck, but it happens a lot on old motorcycles.

I've got rid of the 22re about 6 months ago and I'm having trouble recalling which parts are susceptible to water issues.

 

[alteredraptor]

ah, ok, I gotcha, looks like I got a nice little list to work with for a little bit.

 

[alteredraptor]

well, sorry for the late update, turns out my dizzy had a bad seal, fixed it with silicone!!

 

[raevenzero]

Great!

 

[alteredraptor]

very much so, I took off the cap and saw the seal was dry rotted and almost fell apart when I touched it