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post #1 of (permalink) Old 12-29-1999, 02:57 PM
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Diagnostic Codes Help

I currently own a 1988 Ford Bronco. It has the 4.9, and 5 speed transmission. Unfortunately I live in California and have to smog this beast. Before I went in I checked the diagnostic codes, and pulled 2 codes. Code 34, and code 67. Well thinking code 34 was a bad EGR Position sensor, I replaced it and cleared my codes. My check engine light didn't come back on. The Bronco runs good and idles near perfect with no stumble or surges. So I took it into the smog shop, and it failed. The mechanic told me that my timing was advanced to 15 degrees, when it was supposed to be at 10. The other problem was my EGR valve wasn't working properly. With that in mind I replaced the EGR valve. Now I was ready to set my timing. I started up the truck, and my idle was too high. it now idles at about 1300 - 1400. Frustrated I headed home, and one the freeway my check engine light came on, and went off. It did this all the way home. When I got home I pulled the codes again. The same 2 codes, 34 and 67 were back. Code 34 says: EGR Valve Position/ Pressure Feedback EGR voltage above closed limit. Code 67 says: Manual Lever Position Sensor out of range - A/C on /// Clutch switch circuit failure. Any ideas on what to to fix my problem would be greatly appreciated. Thank You

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post #2 of (permalink) Old 12-29-1999, 11:54 PM
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Re: Diagnostic Codes Help

Ignore code 67. I get a similar code on my 93 that means the same thing but says Auto Lever Position Sensor out of range and the crap about the AC. I checked with the guys at Ford, they said that this code is not unusual, just ignore it. As for the other code, you did everything I would have done, can't help you there. Sorry!

Curtis
93 Bronco, 351, 4" lift, 32-11.5
71 Bronco, 302 BOSS, 3" lift, 30-12.5

post #3 of (permalink) Old 12-30-1999, 08:44 PM
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Re: Diagnostic Codes Help

Check your EGR control solinoid, Pop the little cap off and look at the air filter, I've seen a few plugged up causing a constant vac to the EGR not letting it close all the way. Also when you replaced the EGR did you replace the EVP (EGR valve position sensor) on top of the EGR? Thats all I can think of now let me know what you find on the control soliniod.

Ford guy with twin rockcrawling Samurai's [img]/wwwthreads_images/icons/wink.gif[/img]
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