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| skirlin | Running bad, codes, Need Help Please | ||
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Senior Guru
 
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Hello everyone, it's been awhile. My 92 has been running great until now. It started running very rough (engine shakes like it has a huge cam), spark knocking, back firing, and lousy acceleration. All gauges look normal. It is a 1992 Lt1 with almost 160k, no mods, automatic. My first thought was the Opti and I did some research here and that sounded close. I used Andy's write up for checking codes (very cool, thanks Andy)but what I got back was not what I had expected.
1 C.12 4.H28 Quad Driver 3 H32 EGR Valve/circuit H68 A/C Relay error (explains why AC never shuts off). H72 Gear Selector Switch Error --- 9. --- I grabbed my Helms Manuals (again, the first purchase after I got my 92 as recommended by the Gurus)I found everything in the manuals. My question is: Can an faulty EGR Valve cause this much trouble? Does this info tell you something I am not seeing? Any help would be much appreciated. Thank you |
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Posted on: 2011/8/16 22:48
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| BillH | Re: Running bad, codes, Need Help Please | ||
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The Stig Moderator
 
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Quote:
It does sound a bit much for the EGR, frankly, it sounds like a vacuum leak(s). But you're going to have to take care of the EGR anyway, it's either the valve or the solenoid. Did you get a check engine light with the H32? Usually it will turn off the next time the key is cycled. The Quad Driver probably is because of the bad a/c relay/connection. Don't worry about it until the a/c is fixed. The QD just mointors the voltage in the ECM/Fan circuit. H72 - don't worry abouy it. Clear the codes. Check for vacuum leaks and fix the EGR. That's the first step. |
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Posted on: 2011/8/16 23:37
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| josephf31 | Re: Running bad, codes, Need Help Please | ||
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My guess would also be that the EGR would not cause that much trouble. What are the first 2 codes?
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Posted on: 2011/8/17 0:40
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| BillH | Re: Running bad, codes, Need Help Please | ||
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The Stig Moderator
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C12 means there are no codes (at the time the codes are read). Almost all codes switch from C (current) to H (history) when the key is turned off. H28 is the Quad Driver, module 3, monitors voltage it the ECM to fan relay circuit. |
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Posted on: 2011/8/17 0:44
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| josephf31 | Re: Running bad, codes, Need Help Please | ||
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Thanks; none of those sound like (to me) they would cause the symptoms reported. Not to be pessimistic but it sounds more serious; possibly bad injector(s), distributor gear/timing chain? Just thinking out loud, not sure any of those would throw codes... |
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Posted on: 2011/8/17 0:48
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2002 Magnetic Red C5 6 spd LS1 convertible |
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| skirlin | Re: Running bad, codes, Need Help Please | ||
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Senior Guru
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Thanks for the reply. You are right on Bill with the H32, it would pop on half way home, then it would be out the next time I started it up. I've had four trouble free years of driving it, I've added lots more miles. I figured eventually things would start wearing out. I'll fix the EGR valve and look for vacuum leaks. I foot in front of the other, thanks gents
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Posted on: 2011/8/17 1:22
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| BillH | Re: Running bad, codes, Need Help Please | ||
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The Stig Moderator
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Yea, that's very typical for an LT1 EGR. If you replace the EGR yourself, stuff some rags in the gap between the firewall and bellhousing, loosing a EGR bolt down there is a bitch. Don't forget to clear the codes. |
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Posted on: 2011/8/17 1:30
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