99 blazer wont start after rain or too hot and humid

[BlazerLT]

Originally Posted by metallica21156

it never set off the code. it never had a problem when it was running. if it would have it might have triped it.

Comon bro, stop telling people to take shots in the dark and do the logical thing first which is a full tuneup with fuel filter.

You NEVER just tell people to randomly start replacing sensors with no backing reason.

[metallica21156]

like i said.we did a complete tune up.replaced the disturbuter and then changed the sensor after it didn't work.

[BlazerLT]

Well let's have this guy do the tuneup first and then work from there.

[mrrob]

My Service Trucks are all Chevs!

Very Common, look inside the center of the cap for carbon deposits ,my own personal truck did the same thing!

Luckly I had a new Cap/Rotor in Stock !

Mr.Rob

Lic Mech Auto/Truck/Trailer Ect....

[metallica21156]

did u fix ur problem? mine started acting up the other day after being fixed for a year. can't see how the sensor would be bad again.even if you put water on the motor and let it soak it won't trigger it. any luck fixing yours?

[BlazerLT]

In his cse it sounded like condensation and moisture getting into the cap.

When the cap is cooling , it will contract and draw air in with the moisture if it isn't properly sealed.

[metallica21156]

how would i be able to check this or fix it. i didn't put the cap in. a shop did it. it still wasn't fixed when we got it back from the shop a year ago and then after a while it wnt away. they said the computer had to relearn. i think theres a vac line to it from what i've read. could there be something with that or the cap its self?

[BlazerLT]

yes, a bad cap and rotor will cause this.

[metallica21156]

they changed it a year ago. could it be doing it again?it runs fine. i ran it hard sitting there and then shut it off and tried to start it and it wouldn't. if i keep trying even if its cold after about 20-30 starts it will run and once its running its fine. we tried putting injector cleaner in since its never been done. a friend of mine said the injectors could be getting water on them and not letting it run.

[Mikado14]

Hold on.....20 to 30 starts or tries?

Ummmm, did you check your fuel pressure? Perhaps your interrelating problems.

Just a quick cursory thought.

[metallica21156]

it tries to start like the engine turns over and then the started disingages because the engine kicks over goes to about 900-1,000 rpm and then shakes to a stop. the only thing i noticed is the the intake looked a little wet and had a strong smell of gas even after it sat all night. do u know what the psi ratings are for this motor. its a v6 4.3 vortech.sfi.would i be able to pull a plug and see i'm not getting fuel. the engine runs a little rough but after running some cleaner and running it hard it seems to be a little smoother.

[Mikado14]

If your smelling gas, remove your plenum and go back and inspect your work from when you installed your CPI unit.....

Did you install a new nut kit?

...after you get the plenum off, turn the key on BUT DO NOT START IT!!! Look and see if the lines or the regulator are leaking.

[metallica21156]

it doesn't have a cpi. gas mileage is very good and it doesn't smoke. it has the sfi injection. it doesn't look washed either.

[Mikado14]

Sorry 'bout that, got my wires crossed.

Ok, sequential not central. Individual injectors fed by a fuel rail and you smell gas. At this point, I would say that you may have an injector that is drolling. When you shut off the engine, the residual pressure in the fuel rail is being relieved via the drooling injector. When you go to restart, you now have a flooded condition.

Without the proper tools and from your posts, I would recommend a shop to perform the work. However......guess you don't have a fuel pressure guage....... yeah, better have someone check it for you.

[metallica21156]

but it also does it right after sitting all night. and if u drive it when its wet it works fine. starts fine and everything.