1997 SATURN SC2 #1 AND #4 CYLINDERS NOT FIRING

  • Tiny
  • HondaMike
  • 1997 Saturn SC2

Computer problem
1997 Saturn SC2 4 cyl Two Wheel Drive Manual 199000 miles

#1 and #4 cylinders not firing. Thought it was the coil (since there are 2 of them) and it did not fix the problem. I switch the coils only to have the same results of #1 and #4 not firing. I then replaced the module hoping that it was the problem. Well. It did not fix it. I am not very familiar with Saturns ( I was a Honda Tech) so I do not even know where the PCM is located. Is the PCM the next thing to replace?

I am going to borrow an OBD to pull the codes later, but if anyone has experienced this delima, I would appreciate any help!

Friday, April 30th, 2010 AT 2:38 PM

8 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts

The PCM is the last thing I would replace they hardly ever go bad on those. It's located under the dash on the driverside if u look up under there u can see the connectors. Get a noid light check both the number 1 and 4 injector connectors for signals while it's running. Also perform a compression test on all the cyls and let me know what they were. Also let me know if there is any codes.

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Friday, April 30th, 2010 AT 4:54 PM
  • Tiny
  • HondaMike
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Got plenty of compression. I got a code PO340 - but this does not have a cam sensor. So I believe it is the result of the misfire, not the cause.

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Tuesday, May 4th, 2010 AT 8:16 PM
  • Tiny
  • saturntech9
  • Expert
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The most likely cause of ur p0340 its usually wires and plugs they get this black carbon on the wire ends wire they meet the plugs the plugs also the coild towers get corroded up causing the code p0340. Thats strange ur number 1 and 4 cyclinders dont fire but u dont have a p0301 or a p0304 or even a p0300 random missifire. Does ur number 1 or 4 fire at all?If u pull each wire off and put it back on one at time do u loose rpms?Also is ur 1 and 4 coil sparking at all?Did u see if u have injector pluse signal to those injectors?Let me know.

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Tuesday, May 4th, 2010 AT 9:22 PM
  • Tiny
  • HondaMike
  • Member

Replaced all wires and plugs. I even swapped the coils only to have #1 and #4 still not fire. I pulled the plug in #1 and it smelled of gas, so I assume that it is getting fuel. The other item I am going to check is the crank sensor. I was thinking if the crank sensor was bad, it would not run at all, but.

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Tuesday, May 4th, 2010 AT 10:04 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts

Ur right if the crank sensor was bad it wouldn't run at all or it would run warm up then die. So if u take off ur 1 and 4 wires off ur coil and crank it over does it spark from post to post?If not let me know.

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Wednesday, May 5th, 2010 AT 12:22 PM
  • Tiny
  • HondaMike
  • Member

No - it does not spark from post to post with the wires off.

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Wednesday, May 5th, 2010 AT 1:29 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,821 posts


http://www.2carpros.com/forum/automotive_pictures/416332_1997_sc2_engine_performance_wire_part1_1.jpg



http://www.2carpros.com/forum/automotive_pictures/416332_1997_sc2_engine_performance_wire_part2_1.jpg



http://www.2carpros.com/forum/automotive_pictures/416332_1997_sc2_engine_performance_wire_part3_1.jpg



http://www.2carpros.com/forum/automotive_pictures/416332_1997_sc2_engine_performance_wire_part4_1.jpg



http://www.2carpros.com/forum/automotive_pictures/416332_1997_sc2_p0340_cicurit_description_1.jpg



http://www.2carpros.com/forum/automotive_pictures/416332_1997_sc_p0340_part1_1.jpg

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Thursday, May 6th, 2010 AT 3:24 PM
  • Tiny
  • saturntech9
  • Expert
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http://www.2carpros.com/forum/automotive_pictures/416332_1997_sc2_p0340_part2_1.jpg


i would follow that p0340 trouble tree i posted for u that looks like the problem ur 1 and 4 signal to ignition module.i also posted wire diagrams and circuit description.let me know what u find.

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Thursday, May 6th, 2010 AT 3:32 PM

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