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Old 09-09-2013, 07:42 PM   #1
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Sensors that lead to misfire

I have a small misfire and its bugging me because I can't figure it out. The engine shakes at idle a little but is fine accelerating. i already replaced the upper intake gasket and don't have a vacuum leak. I already changed oil, plugs, wires and coil so I'm thinking it's a bad sensor somewhere but the computer is only throwing a bad catalytic converter code. Which sensors can contribute to misfiring and which ones should I replace first?
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Old 09-09-2013, 08:44 PM   #2
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I have a small misfire and its bugging me because I can't figure it out. The engine shakes at idle a little but is fine accelerating. i already replaced the upper intake gasket and don't have a vacuum leak. I already changed oil, plugs, wires and coil so I'm thinking it's a bad sensor somewhere but the computer is only throwing a bad catalytic converter code. Which sensors can contribute to misfiring and which ones should I replace first?
Maybe one of your cats is clogged?
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Old 09-10-2013, 12:44 AM   #3
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If there is a misfire then it has to throw some sort if code as to which cylinder. Are you sure you connected the wires to coil in the correct firing order??? Are your plugs gapped correctly? A broken manifold can also cause this
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Old 09-11-2013, 10:59 AM   #4
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Yes I'm sure I connected the wires correctly or else you barely drive the thing. The computer doesn't always throw codes for every little problem. I just have a blown cat on the passenger side.
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Old 09-11-2013, 11:17 AM   #5
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What do you mean by a blown cat?
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Old 09-11-2013, 11:19 AM   #6
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Cat is throwing codes because its malfunctioning
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Old 09-11-2013, 11:50 AM   #7
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That means the cat is clogged. The fumes are not escaping properly and exhaust gas is getting stuck in the chamber. It can cause problems with a engine.
Don't take my word. Get someone to press on the gas petal and put your hand near the exhaust tip. You will feel a hesitation in the flow. Them gases are stuck in your head and causing problems.
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Old 09-11-2013, 07:48 PM   #8
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No necessarily, it could just mean the cat is worn out and not functioning at 100% effectiveness
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Old 09-12-2013, 07:57 PM   #9
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No necessarily, it could just mean the cat is worn out and not functioning at 100% effectiveness
If the car is misfiring you WILL get a code. It's not a "little thing" so find out what cylinder.
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Old 09-12-2013, 08:43 PM   #10
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If the car is misfiring you WILL get a code. It's not a "little thing" so find out what cylinder.
The motor shakes at idle but it fine on acceleration. My idle has been weird in the past and has stuck at certain rpms at idle. I don't think it's a vaccum leak because I hear no sucking noises and its not a continuous shake. It hesitates
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Old 09-12-2013, 09:59 PM   #11
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The motor shakes at idle but it fine on acceleration. My idle has been weird in the past and has stuck at certain rpms at idle. I don't think it's a vaccum leak because I hear no sucking noises and its not a continuous shake. It hesitates
Definitely coil pack, spark plug wires or spark plug problem. Check all of them
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Old 09-12-2013, 10:41 PM   #12
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Could be a dirty or malfunctioning fuel injector...
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Old 09-13-2013, 04:21 AM   #13
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I think it can be the iac because it fluctuates and sticks at certain rpms and I run a little high on my idle. It's random like ill be driving and press the clutch down and the rpms will stay at 2k or so. What are common symptoms of bad iac?
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Old 09-14-2013, 05:28 PM   #14
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I think it can be the iac because it fluctuates and sticks at certain rpms and I run a little high on my idle. It's random like ill be driving and press the clutch down and the rpms will stay at 2k or so. What are common symptoms of bad iac?
Rough idle and eventually low rpms that it will stall iut
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