90 460 problems
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From: Alaska
90 460 problems
I'm working on a buddies 90 F-350 with a 460. For some reason this truck is running RICH, and it doesn't idle very well. I checked the fuel pressure, at idle it showing 39psi, and when you shut it off it holds the pressure. So I beleive the regulator is ok, and the there are no injectors stuck open.
I have pulled codes and get a 31-EVP out of range, 42-system rich. I tried to ge the EGR pipe disconnected, but broke the EGR pedistal. Finnally got it off and played the the EGR and it is reading low. So I thought I would fire it up again the the EGR disconnected, and it actually ran a little better. It wasn't over fueling as much, but still running rich. I re-ran the KOER test and then got the these codes 31-EVP out of range, and now a 41-system lean??? I no it is still rich cause it burns my eyes here in the shop.
I guess I'm not sure what my next step should be. I think I will go ahead and replace the EVP and EGR. Anyone no what else could make this thing run so rich?
I have pulled codes and get a 31-EVP out of range, 42-system rich. I tried to ge the EGR pipe disconnected, but broke the EGR pedistal. Finnally got it off and played the the EGR and it is reading low. So I thought I would fire it up again the the EGR disconnected, and it actually ran a little better. It wasn't over fueling as much, but still running rich. I re-ran the KOER test and then got the these codes 31-EVP out of range, and now a 41-system lean??? I no it is still rich cause it burns my eyes here in the shop.
I guess I'm not sure what my next step should be. I think I will go ahead and replace the EVP and EGR. Anyone no what else could make this thing run so rich?
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Originally Posted by roan65
I have pulled codes and get a 31-EVP out of range, 42-system rich. I tried to ge the EGR pipe disconnected, but broke the EGR pedistal. Finnally got it off and played the the EGR and it is reading low.
I no it is still rich cause it burns my eyes here in the shop.
The EGR will affect your mixture. At idle it should only affect it if it is leaking.
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From: Alaska
sorry, It was a long day, and I think the fumes were getting to me. lol
Yes I took the EGR out and tested it. The ohm reading was low compared to what the manuel said was acceptable. I left it unhooked from the EGR pipe, but left the vaccum line and EVP sensor hooked up, and started the truck. That is when it ran better, but still not good. I did find that the TPS is bad, so I'm going to replace it, and the EGR and see what happens from there.
Yes I took the EGR out and tested it. The ohm reading was low compared to what the manuel said was acceptable. I left it unhooked from the EGR pipe, but left the vaccum line and EVP sensor hooked up, and started the truck. That is when it ran better, but still not good. I did find that the TPS is bad, so I'm going to replace it, and the EGR and see what happens from there.
