1992 EGR question
#1
1992 EGR question
I know this site is for later model F150's, of which I've had 2, a 1999 and a 2000, but now I've got a '92 lifted 4x4. It's throwing a code 33 and a 77. I know the 33 is an EGR issue, but does anyone know what the 77 is? Also, is there a way to know if it's the EGR valve or the sensor? Thanks for the help. I love this truck-best F150 I've ever owned! -Al Nobles
#2
Code 33 is no EGR opening detected.
It can be the EVR, the hose. the EGR or the EVP.
EVR controls application of vacuum to the EGR.
EVP is what reports the action back to the EEC.
Any failure in this hardware path will cause the code.
Code 77 is a failure to detect a WOT during self testing.
The IAC controls all the rpm self testing.
It can be the EVR, the hose. the EGR or the EVP.
EVR controls application of vacuum to the EGR.
EVP is what reports the action back to the EEC.
Any failure in this hardware path will cause the code.
Code 77 is a failure to detect a WOT during self testing.
The IAC controls all the rpm self testing.
#3
Join Date: Nov 2006
Location: Memphis, TN 38135, USA, Earth
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Actually, code 77 is an operator error. The IAC doesn't affect the TPS, and that code is set when the dynamic (operator) response of stomping the gas pedal isn't detected. For more info, read this thread. But you can ignore that code.
A common source for 33 (or any code that might result from a vacuum leak) is a crack in the hard plastic vacuum lines. Common locations include at the "coffee can" on the R wheelwell, the white vacuum line in the R rear corner of the engine bay going to the recirc motor, & the back of the engine near the EGR tube on 4.9Ls. (What engine do you have???) To fix this type of leak, break the original line apart, & slip some tight-fitting rubber vacuum line over the ends to rejoin & seal it.
A common source for 33 (or any code that might result from a vacuum leak) is a crack in the hard plastic vacuum lines. Common locations include at the "coffee can" on the R wheelwell, the white vacuum line in the R rear corner of the engine bay going to the recirc motor, & the back of the engine near the EGR tube on 4.9Ls. (What engine do you have???) To fix this type of leak, break the original line apart, & slip some tight-fitting rubber vacuum line over the ends to rejoin & seal it.
#5
Originally Posted by Steve83
Actually, code 77 is an operator error. The IAC doesn't affect the TPS, and that code is set when the dynamic (operator) response of stomping the gas pedal isn't detected. For more info, read this thread. But you can ignore that code.
A common source for 33 (or any code that might result from a vacuum leak) is a crack in the hard plastic vacuum lines. Common locations include at the "coffee can" on the R wheelwell, the white vacuum line in the R rear corner of the engine bay going to the recirc motor, & the back of the engine near the EGR tube on 4.9Ls. (What engine do you have???) To fix this type of leak, break the original line apart, & slip some tight-fitting rubber vacuum line over the ends to rejoin & seal it.
A common source for 33 (or any code that might result from a vacuum leak) is a crack in the hard plastic vacuum lines. Common locations include at the "coffee can" on the R wheelwell, the white vacuum line in the R rear corner of the engine bay going to the recirc motor, & the back of the engine near the EGR tube on 4.9Ls. (What engine do you have???) To fix this type of leak, break the original line apart, & slip some tight-fitting rubber vacuum line over the ends to rejoin & seal it.
#7
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#8
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Originally Posted by selbona
I can't figure out wha't going on with my '92 F150 with a 5.0. I'm getting a code 33. I've replaced the EGR valve sensor and cleaned the EGR. It seems okay. I can't figure out how to do a vaccum test on the rest of the system. I've read the Haynes manual for this, but it may as well be in Spanish, because I'm just not understanding it. The throttle also acts like it's sticking sometimes. Not all the time, but sometimes, like the automatic choke won't cut off or something. Could all this be related? My gas mileage sucks too. Anybody got any ideas. Thanks.
#9
If you find one of those rigid plastic vacuum lines is broken in one place but is otherwise ok, not brittle, best repair I know of is with milspec-quality heatshrink tubing, if you buy one of those expensive assortment packs in the auto store, you can sometimes get the weatherproof stuff that comes with a glue lining, you'll get a perfect seal, or, you can put some auto silicone on the rigid line a little distance from the break either side (you don't want to get silicone in the line!) and slip regular high temp heatshrink on, long enough to cover the silicone, then shrink using a paint stripper hot air gun set to low (usually specifically made for doing heatshrink) - don't overshrink it where the break is, or you'll constrict the line...
Should outlast the rest of the line.
Should outlast the rest of the line.
#10
Originally Posted by pjb999@yahoo.co
If you find one of those rigid plastic vacuum lines is broken in one place but is otherwise ok, not brittle, best repair I know of is with milspec-quality heatshrink tubing, if you buy one of those expensive assortment packs in the auto store, you can sometimes get the weatherproof stuff that comes with a glue lining, you'll get a perfect seal, or, you can put some auto silicone on the rigid line a little distance from the break either side (you don't want to get silicone in the line!) and slip regular high temp heatshrink on, long enough to cover the silicone, then shrink using a paint stripper hot air gun set to low (usually specifically made for doing heatshrink) - don't overshrink it where the break is, or you'll constrict the line...
Should outlast the rest of the line.
Should outlast the rest of the line.