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3 Posts
Discussion Starter · #1 ·
I have a 2000 hyundai accent 1.5 - I ran the computer on it and initially got the codes P0301 and P0303 which was a misfire in cyl. 1 and 3

the symptoms... mostly smooth idle, when increasing power (under load or in nuetral) it stumbles really bad.... after getting up to around 20-30 mph the stumble goes away...

did search on the forums and found that it might be plugs, plug wires, coil packs....

number 3 terminal tower on the coil pack was burned pretty bad... all other terminal towers look ok...

done so far....

new plugs, new wires, and new coil pack

checked codes again and no codes showing.... but now stumbles a little less.. like only one cyl. is missing instead of two....

now it stumbles up to around 30mph

any suggestions? I know it seems to be a major problem with this car... and doesn't seem to be any definitive fix...


· Registered
3 Posts
Discussion Starter · #5 ·
QUOTE (sbr711 @ Jun 16 2010, 12:19 PM) index.php?act=findpost&pid=333487
Spritz along seam where intake manifold meets cylinder head (intake gasket) with some carb.. see if it act funy when carb hits a leak and engine changes..

Compression test both dry and wet, and a cylinder leak down test..

sprayed some carb cleaner fluid around the intake manifold... no change.... in the RPM....

Took out the plugs and they all look great... even light grey color, no oil residue

took compression readings dry and wet and they are really screwy....

as follows:

about 10 engine revolutions per test

about 1/2oz of oil in each cylinder for wet test letting it sit a couple minutes

cyl. Dry Wet
1 150 120
2 140 170
3 135 175
4 120 150

like I said weird... maybe Im doing this wrong.... whats the best way to do the compression test? how many engine
revolutions should be done?

forgot to mention one thing.... the exhaust CO2 is original with 110k on the car.. tried last year to remove it, but its stuck fast, I have a new one and am soaking it now to see if I can replace it

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