Code 33 on 92 Ford Explorer
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According to my book, a 33 indicates that the EGR valve either is not opening or is not seated (closed) properly. If it's not seated, I'd suspect a carbon buildup holding the valve open. A stuck open valve would cause a poor idle.
Try pulling the vacuum hose off the EGR valve, and see if applying vacuum to the EGR causes it to stumble at idle. If it does, that means the valve is opening and is OK. If the valve is OK, then I'd look at the EVP sensor being faulty. Hope this helps.
Try pulling the vacuum hose off the EGR valve, and see if applying vacuum to the EGR causes it to stumble at idle. If it does, that means the valve is opening and is OK. If the valve is OK, then I'd look at the EVP sensor being faulty. Hope this helps.
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From: UT
The biggest problem with getting a 33 on a '92 Explorer is that Ford didn't put an EGR system onto the '92 4.0. I believe '93 was the first year they put an EGR onto the 4.0. Are you certain it's not a "111" (pass) code? What type of code is it (KOEO hard fault, continuous memory, or KOER)?
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From: Vegas Baby
Thanks mrshorty. I was trying to look for the EGR valve and couldn't find it, thought I was going crazy. I get the code with KOEO and KOER. When I tested the X a few weeks ago I got the 1-1-1 code (it has a longer pause in between each flash). So originally I got the 1-1-1, then separator flash then 1-1-1. Now I get 1-1-1 pause 1-1-1, separator flash, then 1-1-1 pause 1-1-1. I believe that's a 33 code. I'll take it to AutoZone so they can scan it out with a better scanner, one that reads out numbers and not flashes. Maybe it is a pass code since there's no EGR system. Could the 33 code stand for anything else? One of the reasons I checked for a code was when the engine was cold it would start then stall a couple times. After that it would idle perfectly. Maybe the IAC needs a cleaning.
Last edited by JTD1972; May 22, 2004 at 03:02 PM.
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From: UT
What you describe sure sounds to me like pass codes for both the KOEO hard faults and the continuous memory. It's really hard to tell over the internet. Main reasons I believe that what you are seeing is 111 instead of 33:
1) '92 should be putting out three digit codes and not two digit codes.
2) Codes are output twice for each part of the test. (111 pause repeat 111 separator pulse continuous memory 111 pause repeat 111). Not sure what happened when you previously got the 111 that it looked different, but what you most recently describe sure looks to me like pass codes for both parts of the test.
Might be worth going to Autozone. One word of caution, though. Pulling codes on these older vehicles isn't their strong point. They may try to tell you that they can't pull codes because the check engine light isn't currently on. Or they may not know how to hook up the scanner to it to get the codes. Just be prepared to try two or three people at a given store or even multiple stores until you find someone who is capable of running the test.
1) '92 should be putting out three digit codes and not two digit codes.
2) Codes are output twice for each part of the test. (111 pause repeat 111 separator pulse continuous memory 111 pause repeat 111). Not sure what happened when you previously got the 111 that it looked different, but what you most recently describe sure looks to me like pass codes for both parts of the test.
Might be worth going to Autozone. One word of caution, though. Pulling codes on these older vehicles isn't their strong point. They may try to tell you that they can't pull codes because the check engine light isn't currently on. Or they may not know how to hook up the scanner to it to get the codes. Just be prepared to try two or three people at a given store or even multiple stores until you find someone who is capable of running the test.
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