failed smog
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From: fallbrook ca
failed smog
just failed smog
I have an 89' e250 with a 351. tech said "possible EGR or cat" Can anyone kindly direct a newb to said EGR and aside from checking tubes (what i've learned so far) are there trouble shooting tips??? any and all help would be great!!! P.S. the numbers on the NO where 756 @ 15 mph and731 @ 25 mph
I have an 89' e250 with a 351. tech said "possible EGR or cat" Can anyone kindly direct a newb to said EGR and aside from checking tubes (what i've learned so far) are there trouble shooting tips??? any and all help would be great!!! P.S. the numbers on the NO where 756 @ 15 mph and731 @ 25 mph
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If your CO is good, the cat is doing it's job. Only if the cat was way overheated would in make the NO go up methinks.
So the EGR is probably the issue. The whole purpose of the EGR is lower combustion temps, which in turn lowers NO.
As for evap, did he test and exclude the fuel cap as the cause? If so, you'll have to trace the system from the fuel cap to the engine for vacuum and vent line issues. Do you ever smell gas or have leaks?
So the EGR is probably the issue. The whole purpose of the EGR is lower combustion temps, which in turn lowers NO.
As for evap, did he test and exclude the fuel cap as the cause? If so, you'll have to trace the system from the fuel cap to the engine for vacuum and vent line issues. Do you ever smell gas or have leaks?
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From: fallbrook ca
no noticeable leaks nor odors. I'm a novice when it come to auto mechanics but I want to do as much on my own as possible so that I am confident in my vehicle. that being said could you enlighten me on how to inspect and trouble shoot the EGR?? understand that I dont even know where it's located but I have tools and a get er done attitude
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check for vaccum leaks, do basic tuneup,clean out soot inside egr maybe egr valve is dirty, run gas tank down to 1/4 full then add a quart of denatured alcohol from homedepot to gastank, then straight to get it tested,,never tried that but i heard it works, some use rubbing alcohol
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Cargo Master
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From: Eastern TN
Not familiar with the '89 but EFI engines typically have the EGR valve attached to the upper intake manifold downstream of the throttle body. A pipe leads runs up to the EGR valve from the forward end of the starboard exhaust manifold.
If the EGR valve has a vacuum actuator, pulling a vacuum on it with the engine idling should cause a stumble or drop in idle. I don't know how to do this basic test if the EGR valve has an electric actuator.
Sixto
'93 E150 Chateau 5.8 185K miles
If the EGR valve has a vacuum actuator, pulling a vacuum on it with the engine idling should cause a stumble or drop in idle. I don't know how to do this basic test if the EGR valve has an electric actuator.
Sixto
'93 E150 Chateau 5.8 185K miles
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Regarding the fuel system failure. Sometimes it as simple as getting a new gas cap. I failed a few years ago and that's all I had to do was replace both gas caps with new ones.
I have added alcohol to my fuel for emissions testing but if you have E85 available it's cheaper and easier to add some of that to your fuel. Try not to go any higher then 20% alcohol. E85 is 85% ethanol you may have to do some math and estimate how much fuel you have in your tank at the time of adding the E85, and right after the test fill your tank with the E10 gasoline!
I have added alcohol to my fuel for emissions testing but if you have E85 available it's cheaper and easier to add some of that to your fuel. Try not to go any higher then 20% alcohol. E85 is 85% ethanol you may have to do some math and estimate how much fuel you have in your tank at the time of adding the E85, and right after the test fill your tank with the E10 gasoline!
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