High NOX - Didn't pass smog - Need Help
#11
#12
Paul - Assuming you have no check engine lights now and all your cylinders firing as they should, it sounds like possibly a lean condition from a vacuum leak or the ignition timing too far advanced. Either one of those could deliver high NOX readings. Check for any faulty vacuum lines or even a bad power brake booster, and inspect to make sure the distributor initial timing is set to spec.
#13
[QUOTE=zonker;3398462 it sounds like possibly a lean condition from a vacuum leak .[/QUOTE]
No personal experience with this motor, but, thinking out loud here, I would look down the throttle body bores and see it there is oil in the intake. If so, then the bottom plate on the intake is leaking, and this could be your vacuum leak. From what I understand, this plate gasket failure is a common problem on these trucks.
No personal experience with this motor, but, thinking out loud here, I would look down the throttle body bores and see it there is oil in the intake. If so, then the bottom plate on the intake is leaking, and this could be your vacuum leak. From what I understand, this plate gasket failure is a common problem on these trucks.
#14
No thermostat
Truck was never getting over 160 degrees. Checked thermostat, and there wasn't one. I read somewhere that until the engine reaches temp it will run lean. Did a lot of things yesterday.
new 195 degree thermostat
flushed cooling system
New CPV and hose
fresh coolant
new plugs
Added sea foam to gas tank, crankcase, and sucked in vacuum line.
still need to run the tank dry
and change the oil.
Last monitor (O2 sensor heater) is now reset.
Once the gas in gone and I refill it, I'll try getting it smogged again.
I'm hopeful but not optimistic.
What are your guesses, pass or not???
new 195 degree thermostat
flushed cooling system
New CPV and hose
fresh coolant
new plugs
Added sea foam to gas tank, crankcase, and sucked in vacuum line.
still need to run the tank dry
and change the oil.
Last monitor (O2 sensor heater) is now reset.
Once the gas in gone and I refill it, I'll try getting it smogged again.
I'm hopeful but not optimistic.
What are your guesses, pass or not???
#18
#19
#20
I dont know the answer to that question. To be honest I followed the spark plug wires to the back of the engine until they disappeared from easy sight. I didn't see an obvious distributor cap and just assumed the timing was not adjustable. Add to that the factory sticker on the hood that states no adjustment is necessary (it doesn't say adjustment of what). I'm hoping someone else here answers that question, but if not I'll follow those plug wires to whatever they are connected to using flashlights, mirrors, cell phone cameras step stools or whatever else is necessary. But honestly, I'm getting a little tired of chasing this down and I just want to believe it's already resolved. Do I sound friggen frustrated, lol