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Codes 121 and 336, rough idle?

Tiny
GOGOJUICE6
  • MEMBER
  • 1994 FORD RANGER
  • 2.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 109,000 MILES
Hey, guys, after replacing the whole fuel system, (among the TPS, twice, EGR valve, 1 EGR solenoid twice, etc.) I'm still having idling problems. Not to mention smoke test, negative, comp test was good. I'm getting 121 and 336 codes (closed throttle volts high and EGR volts, high), constant 5.04 V, Signal 1.3 V at TPS. EGR solenoid KOER is 14.5 V. I'm wondering if it's volt regulator burning the sensors.
I'm banging my head (hard) against the walls on this one.
Thanks so much for all your help.
Al
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Tuesday, October 25th, 2022 AT 11:00 AM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,055 POSTS
Yes, the alternator could be creating AC voltage because it has a diode that is out. Check this guide out which shows you how to test for AC voltage. Also, what were your compression readings?

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Please go over this guide and report back.
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Wednesday, October 26th, 2022 AT 9:43 AM
Tiny
GOGOJUICE6
  • MEMBER
  • 70 POSTS
  • 1994 FORD RANGER
  • 2.3L
  • 4 CYL
  • 2WD
  • MANUAL
  • 109,000 MILES
Hey, Ken, cylinder 1 has 160 PSI. #2 170. #3 165. #4 175. Checked for ACV, 0. Still idling rough. Noticed exhaust pipes too hot. Painted them with VHT and paint was burned. Getting an infra thermometer.
Thanks for all your help. Greatly appreciated.
Al.
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Thursday, October 27th, 2022 AT 3:54 PM (Merged)

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