swaycleveland

ok so i just got pinned with a final score of 1149.9 of a possible 966. on the NO emmisions test.. ive been reading lots of blogs about the egr and how to clean it im thinking this is my best bet for passing so , heres my question is it that hard to remove this it seems like the trouble is getting it off. what are the chances of damaging this while i remove it i know my way around a motor well enuff however *&^% does happen. is it best to fnd a junkyard one clean that up and do swap? any other tricks that might bring down my score other then removing this ? and just for the record its a 93 3.0 auto with 193 on the clock air blows cold sunroof and power just begging to be jacked up!!! just bought it for 1600.! i think i did prety well

Georgiadave

I can not identify the reason why you think the EGR valve is bad. There is a good FSM on this site that describes how to trouble shoot the emission system. You can locate the problem and fix it by using this process. Just replacing parts based on intuition is not the way to go.

One quick test of the EGR valve is to connect vaccum to the EGR value port. If the engine dies or runs poorly, the EGR is OK. You can use a vaccum pump or a vaccum line from the intake manifold to do this test.

The EGR valve fasteners are usually corroded and are somewhat inaccessible. Junkyard emission parts are always a gamble. You may be able to clean the carbon from the existing valve, if that is the problem.

Usually these problems are vaccum leaks in the rather extensive collection of tubes and hoses, not the components themselves.

Good luck with this project.

Dave

swaycleveland

after reading may blogs its seems a good pace to start on cleaning and testing the high NO reading seems to be from( after reading the blogs) the egr or pcv valves hey im up for anything d hate to buy a new egr or cat for 200. to pass emissions so.... im heading outside to see if i can get the motor to die or bogg using your method of testing this is my first yota so bear with me im learning and reading at the same time!

SkiRig

What were the various numbers for CO, HC and NOX?

Has the truck been tuned up? I would look at tune up stuff before messing with the EGR. Plugs, wires, cap, rotor, air filter, O2 sensor.....catalyitic converter. My 89 with 175K used to pass with flying colors when it was tuned up.

SkiRig

If it only failed on NO, maybe it is carbon build up in the cylinders or a lean mixture.

swaycleveland

lets see ran 1 can of seafoam about an hour agao blew smoke everywhere which im thinkin is good just vac lined my egr engine wanted to die! so egr is good readings are 1149.9 on "no" passing is 956.0 whats next???

swaycleveland

as far as beeing tuned up the cap plugs any wires have about 15k on them and look great so im thinkin that those are ok no codes are showing im up for anything simple i guess im trying to aviod a costly cat fix

SkiRig

Add a bottle of Techron concentrate to a partial tank of gas and give it the old Italian tune-up (run it hard for a couple days) to also blow out some carbon.

Have you checked the ignition timing?

mikes19984x4

as you stated earlier, if it blew a whole lotta smoke, then you might need to change your plugs. reason for this is because after a good cleaning with seafoam, all that carbon buildup that is being cleaned out will foul up your plugs...

swaycleveland

didnt think of that<<< plug change might be in order after that however after driving for a while now i can say my power has increased and fuel mileage seems better now for the final part lets hope it blew out enuff to pass emissions