Help! I'm Stymied!, Only firing on #3 and # 4 |
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Help! I'm Stymied!, Only firing on #3 and # 4 |
DipShit |
Jun 12 2009, 10:19 AM
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#1
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Member Group: Members Posts: 199 Joined: 26-May 04 From: Cheyenne, WY Member No.: 2,107 |
1.7 D-Jet
Engine was running just great until about two weeks ago, sigh. Now only fires on # 3 and # 4. I have cleaned every connection including all grounds. And I mean cleaned them good! The elecrical appears to be just fine. I get a good noid light at both # 1 and # 2. The injectors have tested just fine as well (I'm getting about 7cc in 15 seconds). I have 40lbs of pressure the 1,2 rail. The spark plugs are getting juice and fire. I have installed new points, cleaned the triggers (which shouldn't have mattered because of the sequence) and set the dwell. I'm a tad under at 44 degrees, but again shouldn't keep # 1 and # 2 from firing. The timing has to be close as it runs really smooth for just two cylinders. If I pull the power to injector 3 or 4, I get a real good drop and she will die. If I pull 1 or 2 - no change. If I add propane to the intake, I get a good response in higher rpm. I had originally traced to the Temp II sensor and it failed, so I replaced it. A new one seemed to be the fix, but only for a moment. I have good fuel, spark and air - (IMG:style_emoticons/default/WTF.gif) I'm STYMIED (or just a REAL DIPSHIT) |
Dr Evil |
Jun 12 2009, 12:09 PM
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#2
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Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region |
The injectors fire in batches of 2 ( 1&4, 2&3) so it is not the points. Pull the injectors on that bank and check the spray pattern. It is possible that you have some crap that clogged those two injectors. They are getting juice as per your noid test.
You need: Spark - checked it and it was good, what do the plugs look like? Dark and sooty? Noid check - good Fuel from the injectors - 7cc/15min, but how was the spray pattern? Big drops? Fuel pressure - checked good at 30psi Propane is useless unless you are checking around things. Putting propane into the intake will give you a boost no matter what. Compression - How is this? The injector wires are not on the wrong injectors are they? Swapped 1 and 2? |
DipShit |
Jun 12 2009, 12:15 PM
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#3
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Member Group: Members Posts: 199 Joined: 26-May 04 From: Cheyenne, WY Member No.: 2,107 |
The injectors fire in batches of 2 ( 1&4, 2&3) so it is not the points. Pull the injectors on that bank and check the spray pattern. It is possible that you have some crap that clogged those two injectors. They are getting juice as per your noid test. You need: Spark - checked it and it was good, what do the plugs look like? Dark and sooty? THEY LOOKED CLEAN AND GOOD Noid check - good - YEP Fuel from the injectors - 7cc/15min, but how was the spray pattern? Big drops? GOOD SPRAY PATTERN AND FLOW Fuel pressure - checked good at 30psi - YEP Propane is useless unless you are checking around things. Putting propane into the intake will give you a boost no matter what. Compression - How is this? - NEED TO CHECK BUT APPEARS GOOD! Had it running on all four briefly again last week when replacing Temp II The injector wires are not on the wrong injectors are they? Swapped 1 and 2? |
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