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Discussion Starter #1
Alright guys, heres my problem. This condition comes and goes, sometimes goes away for days at a time, other times it acts up every time I drive it. There seems to be no rhyme or reason as to why or when it does it, but at times, the car will backfire and hesitate at various speeds, sometimes so bad the car just won't move. To remedy the immediate problem, I can pull over, turn the ignition off, and restart the car, then it will run fine again for a few minutes or even hours. I ran the codes and came up with this
PO52
IO39
IO52
No ACP
No SIR
I did a search on these codes, but they really don't tell me anything. Just FYI also, the cars catalytic converter has been removed, but I have a new one to put back on it, just haven't had the time to have it done, not sure if that could be causing the problem or not. Anyways, thanks in advance.
 

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58 Coupe Deville, 77 Coupe deville, 90 Deville
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184 Posts
Check fuel pressure (with a gauge) when it is acting up, it could be the fuel pump or the pickup in the tank. Also it would'nt hurt to check every vacuum line you can get to and make sure every thing is plugged in etc.
 

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1994 Deville
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24 Posts
Alright guys, heres my problem. This condition comes and goes, sometimes goes away for days at a time, other times it acts up every time I drive it. There seems to be no rhyme or reason as to why or when it does it, but at times, the car will backfire and hesitate at various speeds, sometimes so bad the car just won't move. To remedy the immediate problem, I can pull over, turn the ignition off, and restart the car, then it will run fine again for a few minutes or even hours. I ran the codes and came up with this
PO52
IO39
IO52
No ACP
No SIR
I did a search on these codes, but they really don't tell me anything. Just FYI also, the cars catalytic converter has been removed, but I have a new one to put back on it, just haven't had the time to have it done, not sure if that could be causing the problem or not. Anyways, thanks in advance.
Check the battery cable for corrosion. I had the exact same madness with my caddy and it worked. BTW, be prepared to be laughed at when you talk to your mechanic about it, and be aware that the price for an OEM cable is ~$200
 

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1968 DeVille, 1985 Seville, 1990 Deville, 1994 Deville, 2006 Deville
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43 Posts
These car inherit of bad injectors. Run the computer test to see which injectors are not changing the RPM, you may be surprised. If you need the instructions to do so from the climate control system, let me know, I can walk you through each step. There are threads in here under fuel injectors that will tell you the steps too. A set of clean injectors will make your car run like it just left the showroom.
 
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