Code 15, Code 44, and Code 53...Help??
07-02-2001, 11:19 AM
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Code 15, Code 44, and Code 53...Help??
Car: 86SC LG4, CCC, Rebuilt 700R4
Motor had started to run rough with poor drivability. Seems like timing wasn't advancing or really wierd fuel mixtures. My mechanic and I discovered that someone had removed the bulb from the SES light before I bought the vehicle. We replaced bulb (after replacing a distributor), cleared codes, and started driving. After driving a few short trips, the ECM shot a code 15 (Coolant Temp Sensor Open). We were going to go ahead and replace sensor until ECM shot codes 44 and 53. I think this whole issue is related to one another, but felt the need to turn to the experts. Any help is, as always, greatly appreciated.
Motor had started to run rough with poor drivability. Seems like timing wasn't advancing or really wierd fuel mixtures. My mechanic and I discovered that someone had removed the bulb from the SES light before I bought the vehicle. We replaced bulb (after replacing a distributor), cleared codes, and started driving. After driving a few short trips, the ECM shot a code 15 (Coolant Temp Sensor Open). We were going to go ahead and replace sensor until ECM shot codes 44 and 53. I think this whole issue is related to one another, but felt the need to turn to the experts. Any help is, as always, greatly appreciated.
07-02-2001, 12:43 PM
#2
Jax,
You need to monitor the system voltage from the alternator. The '53' indicates a system overvoltage (above 17.1 VDC) which may be affecting the other error codes or may not. In any case, this needs to be repaired before any damage is done.
I'm guessinbg your lean exhaust (code 44) may be partially caused by the voltage problem, but the CTS failure is not. The failed CTS may contribute to the lean condition, however. If you suspet the CTS and want to make sure, check the resistance of the sensor at a given temperature and compare to this table:
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
You need to monitor the system voltage from the alternator. The '53' indicates a system overvoltage (above 17.1 VDC) which may be affecting the other error codes or may not. In any case, this needs to be repaired before any damage is done.
I'm guessinbg your lean exhaust (code 44) may be partially caused by the voltage problem, but the CTS failure is not. The failed CTS may contribute to the lean condition, however. If you suspet the CTS and want to make sure, check the resistance of the sensor at a given temperature and compare to this table:
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
Last edited by Vader; 03-21-2002 at 11:48 AM.
07-02-2001, 02:49 PM
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Ok, I think I may have figured out the issue. I failed to mention that I have a RF Punch 250 amp, as well as an Alpine V12 F403 amp. After driving for about an hour straight with the amps' power disconnected, I didn't receive any SES lights. Is this right? If it is, what is the correcting step? Higher-powered alt? Thanks in advance.
07-02-2001, 07:53 PM
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Car: 86 T/A
Engine: 5.0 TPI
Transmission: 700R4
A CTS zapped in the frozen state (-°) would enrich the mixture thinking the engine was cold. I would replace the CTS for 10 bucks regardless. If affects too many calculations to take a chance. Then check for any loose vacuum lines around the carb just in case.
Vader would the 86 LG4 be a candidate for an upgraded PROM?
Vader would the 86 LG4 be a candidate for an upgraded PROM?
07-02-2001, 10:17 PM
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Jax,
Yup, it sounds like you figured it out. A 140A Delcotron or 260A Leece-Neville alternator and a 1 Farad capacitor and you should solve most of the electrical problems.
Mike,
ANY car is a candidate for a PROM upgrade. Got a burner?
Hovever, if I understand your question, no. I don't know of any factory upgrades for the LG4. Many fuel issues can be solved with adjustment of the mixture control solenoid instead of reprogramming.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
Yup, it sounds like you figured it out. A 140A Delcotron or 260A Leece-Neville alternator and a 1 Farad capacitor and you should solve most of the electrical problems.
Mike,
ANY car is a candidate for a PROM upgrade. Got a burner?
Hovever, if I understand your question, no. I don't know of any factory upgrades for the LG4. Many fuel issues can be solved with adjustment of the mixture control solenoid instead of reprogramming.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
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