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  1. JohnnyK81

    Electrical Code 91. Replaced O2's. Now Code 41. Runs Rich.

    Nah, rich condition is ever since I got this 67 in a driveable state. :D Only put 400 miles on it so far. Good point about the trouble shooting. Background.. Couple weeks ago I posted about a code 66 and 98 (think it was 98).. Troubleshooted everything, replaced the MAF.. Code 66 went away to...
  2. JohnnyK81

    Electrical Code 91. Replaced O2's. Now Code 41. Runs Rich.

    THanks guys.. As I said, no emissions stuff is mounted. Tried to get the egr on there, but absolutely no room (Everything then hits the shock tower). So could using this resistor cause a horribly rich smell (And terrible gas mileage, to the tune of 12 or so mpg).. What is i put resistors on...
  3. JohnnyK81

    Electrical Code 91. Replaced O2's. Now Code 41. Runs Rich.

    Thanks for the help man. Swapped O2 sensors.. I also swapped ECU's just because on the 67, I had to hide the ECU under the dash so I can't probe it. So I threw on an a9p so I can have it sitting on the seat. Not a great idea to change so many variables, but I'll run the KOER again later this...
  4. JohnnyK81

    Electrical Code 91. Replaced O2's. Now Code 41. Runs Rich.

    Ok, a few things. Found a very small vacuum leak on a rubber plug on the back of the intake.. BUT, I might have cracked it right now while I was messing around back there, AND, I'm not sure how small of a vacuum leak is required to run lean.. especially in only 1 bank? Secondly, pulled off my...
  5. JohnnyK81

    Electrical Code 91. Replaced O2's. Now Code 41. Runs Rich.

    Ooh, well i did make up some EGR resistor doodad quite a few years ago that plugs into the EFI harness egr vacuum solenoid?
  6. JohnnyK81

    Electrical Code 91. Replaced O2's. Now Code 41. Runs Rich.

    Ehh thanks man.. Well both O2's are new, so, I'm not sure.. Suppose I could try though. Yeah, I read through those posts.. Gave the engine a healthy squirting with brake clean while running. I really couldn't find anything. No tubes on the back of engine. Most emissions removed (Crammed in a...
  7. JohnnyK81

    Electrical Code 91. Replaced O2's. Now Code 41. Runs Rich.

    So as the title said, was getting code 91 with KOER. Replaced O2's, now get code 41. No need to post the test path, already did that. Here is what I found. When the car is cold and i probe the computer pins for the O2 sensors, it starts at 4.xx volts?? Then slowly drops to 0.3-6ish volts...
  8. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    Alright guys, well, it WAS as simple as replacing the MAF sensor.. Who woulda thunk it (not I). This now leaves me with a code 33 (to be expected in my scenario), and a 91 (KOER), which I find very odd. Definitely running bleary-eye rich.
  9. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    Not sure why you are getting upset/frustrated? I assure you, I did read and digest the test path, and did it many times, hence why i bought a new MAF. However, I don't want to throw a new MAF and ecu at it at the same time (Although it would be best, I just can't do that). So I just hope if...
  10. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    Welp as I said, replaced maf this morning.. have to a run a KOER tomorrow and see if it's still there.. But, if a signal is only sent OUT, why is it a 4 wire sensor? Should be a 3 wire sensor. You'd be a dear if you measured voltage across C and D with your MAF disconnected... we'd know for...
  11. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    It's a bosch sensor. Believe it needs a 5v signal wire (Just because it doesn't get it from vref doesn't mean it doesn't get 5v). Put new mass in today. Seemed to run much better. Intermittent CEL now. Have to check the code tomorrow. Here's to hoping it's not 66 and 98!
  12. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    Why is it a 2 wire signal system then? I believe that ecu should send 5 volts to maf, and maf sends back, no? Otherwise, if what you are saying is correct, it would be a 3 wire sensor system. HOWEVER, I DO find it strange that unplugged, I am getting 5v to the sensor (which sounds like it...
  13. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    It certainly appears that way doesn't it. I'll grab a new one today, and hopefully if it's the ECU, it doesn't fry it.
  14. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    I thought signal wire sends 5v to the sensor? Sensor knocks it down, no? I was measuring 5v between C and D unplugged.. A and B have the 12v. Wiring CAN'T be messed up.. I ran a straight shot from C and D straight to ecu.
  15. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    Just checked voltage WITHOUT the sensor hooked up (At the harness at the sensor). 5.0v
  16. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    Unfortunately i tried all day, but it's crammed into a 1967 and I really can't probe it, try as I might. BUT, tonight, checked voltage again for the signal at the sensor.. 3.0 up to 8v with a slight rev?! This a sensor issue?
  17. JohnnyK81

    Koer Test Goes To 3000rpm And Stays?

    Well, i DO have code 66.. but I'm stumped.. I swapped computers this morning to try to fix it.. same issue (Although it did idle better?!).. But MAF voltages looked ok.. But then I tried again tonight and the MAF voltages were way off (I swear it shot up to 10 when I revved it a tiny bit!!!! And...
  18. JohnnyK81

    Koer Test Goes To 3000rpm And Stays?

    That can't be normal.. 2 computers now (Both of unknown condition, but appear ok other than a dang code 66), when running a KOER test after reaching operating temperatures, the RPMs shoot up to 3100 or so and slowly lower to 2950 or so.. This, is very obnoxiously loud, and causes it to heat up...
  19. JohnnyK81

    Code 66. 1967 With 87 Harness And Maf

    Nah, I've gone over that checklist many times. I swapped computers today with another of unknown origin. What I've noticed is at idle, MAF jumps from about .9 to 2.0volts.. Which is high.. but code 66 is insufficient voltage? Definitely continuity to the end of the harness.
  20. JohnnyK81

    No Maf Signal

    Nah I'm using stock MAF.. but the voltages all look good.
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