86 GXL Misfire
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86 GXL Misfire
Hey guys, I've searched, and can't find anything quite the same as my issue. My n/a gxl has a misfire at idle (which I'm assuming is also the cause of some other problems it's having). I've set the tps, I've set the throttle, set the timing, and my air/fuel is set to high 11s, low 12s. The idle fluctuates from 625~ to 775~ and the miss is inconsistent. I've done plugs twice and the wires once. Can't find any vacuum leaks, (sprayed carb cleaner and looked visually). Any ideas on what else to check? Don't know what other info you may need. Thanks in advance.
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It misses warm or cold. Any rpm range in neutral, can't tell while I'm driving, but I'm pretty sure it does. If I'm sitting with it in gear with the clutch in, it still misses.
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Does it wind over constantly or erratically?
Might be best to do a compression test..(rotary one or a piston one with the schrader valve removed).
You might have a stuck or broken apex seal...
Might be best to do a compression test..(rotary one or a piston one with the schrader valve removed).
You might have a stuck or broken apex seal...
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Yeah, it starts fine, although it idles really low at first (when it's cold), and sometimes stalls unless I bump the throttle, then it revs up to 1500rpm and stays there until it warms up.
Last edited by manoflego; 05-03-15 at 05:07 PM.
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#8
My car does literally the exact same thing, Iv'e done the same replacements with spark plugs and wires, even the same warm up idle drop until I bump the throttle. The miss is extremely inconsistant hey? Mine can do it 3 times a second then idle for 5 seconds without the miss. I tried to suss if something was earthing but no.... perfect compression on all six too...
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My car does literally the exact same thing, Iv'e done the same replacements with spark plugs and wires, even the same warm up idle drop until I bump the throttle. The miss is extremely inconsistant hey? Mine can do it 3 times a second then idle for 5 seconds without the miss. I tried to suss if something was earthing but no.... perfect compression on all six too...
Is it noticeable when driving?
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My car does literally the exact same thing, Iv'e done the same replacements with spark plugs and wires, even the same warm up idle drop until I bump the throttle. The miss is extremely inconsistant hey? Mine can do it 3 times a second then idle for 5 seconds without the miss. I tried to suss if something was earthing but no.... perfect compression on all six too...
Mine hesitates inconsistently at different rpm ranges, and it's not all the time either, it goes smoothly one time, then hesitates at a random rpm the next time.
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Sorry, it's a miss at idle, and I thought the miss was the cause of the hesitation, but if they're not related, then I'll deal with the hesitation later. How do I tell the difference between a hesitation and a miss while driving?
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A hesitation is a flat spot when you go to accelerate..
A miss is like a pop out the exhaust at idle and kind of a chug when accelerating. Doesn't hesitate just down on power and doesn't run smooth..
A miss is like a pop out the exhaust at idle and kind of a chug when accelerating. Doesn't hesitate just down on power and doesn't run smooth..
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I'm not sure about sparks on all leads, will check soon. Plugs come out dry. I didn't try there under the UIM, will check that soon as well. Thanks for the ideas.
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Best way to tell without a cooling system pressure tester is to warm the engine to operating temp with the rad cap on to pressurize the system.
Once its warm pull the plugs out and wait a few minutes. Then get someone to crank the engine while you watch for water coming out of the spark plug holes..
Once its warm pull the plugs out and wait a few minutes. Then get someone to crank the engine while you watch for water coming out of the spark plug holes..
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Best way to tell without a cooling system pressure tester is to warm the engine to operating temp with the rad cap on to pressurize the system.
Once its warm pull the plugs out and wait a few minutes. Then get someone to crank the engine while you watch for water coming out of the spark plug holes..
Once its warm pull the plugs out and wait a few minutes. Then get someone to crank the engine while you watch for water coming out of the spark plug holes..
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Best way to tell without a cooling system pressure tester is to warm the engine to operating temp with the rad cap on to pressurize the system.
Once its warm pull the plugs out and wait a few minutes. Then get someone to crank the engine while you watch for water coming out of the spark plug holes..
Once its warm pull the plugs out and wait a few minutes. Then get someone to crank the engine while you watch for water coming out of the spark plug holes..
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