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Old 08-15-2006, 05:01 PM   #1
soccer_freak_m@hotma
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Member#: 47261
Join Date: Nov 2003
Chapter/Region: W. Canada
Location: Edmonton, Alberta
Default interesting bucking/shaking/loping issue

Ok, I'm about to cover my basics on this problem.

a. yes I did search
b. I am in the process of changing the fuel filter

Ok, so here goes. My old 99 engine ate itself up - don't ask - LOOOONG story. Anyway I bought a used 2000 block and heads. Once I got everything installed the following started

1. I got a loping idle that only happens once the car has warmed up and the revs have dropped to normal operating temps. It feels like one cylinder isn't firing.
2. When I am driving if I keep the revs at any given rev it will buck and shake like it's detonating, misfiring, or whatever
3. When I rev up or down (or accelerate or decelerate) it acts perfect

To test the situation I've done the following:

1. changed the gas (car had been sitting - I thought bad gas) - helped a little bit
2. checked plugs, wires, coil - all good
3. cleaned out the idle control valve - made it a tiny bit better
4. double checked all lines including breather hoses, pcv lines, fuel lines, and fuel fume lines - all seemed ok
5. unplugged the knock sensor - still had problem
6. unplugged front o2 sensor - still had problem
7. set the idle higher - no help
8. Checked all grounds (I've got a grounding mod) - no problems

Here are my mods:
3" cat back
custom intake using the black box, cone filter, and maf
stage 3 clutch
iridium plugs

The timing belt is brand new as is the tensioner and I am 100% sure the timing is spot on.

Here are some thoughts...

1. front o2 sensor is shot - we did spill coolant down there and I had a ton of smoke(black and white) for the first little while
2. injectors clogged up or not opening - they had been setting for a LONG time
3. fuel filter clogged- see above reason
4. fuel pump shot - has been doing nothing for a long time
5. knock sensor - I'm not sure the correct installation procedure or which direction it should be facing.

If anyone could shed some light on the matter or if you need more info please ask.

-Jeremy
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Old 08-15-2006, 07:04 PM   #2
BURTONRIDR
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Join Date: Oct 2004
Chapter/Region: NWIC
Location: Spokane, WA
Vehicle:
2000 Legacy GT
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Default

ehhhh..... ::shutters:: Dude you should probably check your compression on your cylinders, thats sounds a lot like what mine was doing a few years ago..... It ended up being a fried valve (or two....or three). Anyways ur going to end up paying about as much as it cost you for that engine to fix. I had to do a total valve job on both heads. Another thing to check is to make sure your timing marks are all lined up.
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Old 08-16-2006, 12:52 AM   #3
soccer_freak_m@hotma
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Default

Quote:
Originally Posted by BURTONRIDR
ehhhh..... ::shutters:: Dude you should probably check your compression on your cylinders, thats sounds a lot like what mine was doing a few years ago..... It ended up being a fried valve (or two....or three). Anyways ur going to end up paying about as much as it cost you for that engine to fix. I had to do a total valve job on both heads. Another thing to check is to make sure your timing marks are all lined up.
not to sound like an ass... but...

a. if it was valves it would effected on accel/decel
b. I already said i'm 100% on the timing marks being lined up. if they weren't it'd sound like a diesel.
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Old 08-16-2006, 12:53 AM   #4
soccer_freak_m@hotma
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Default

i think I figured it out... car overheated and boiled the coolant today like I have a blown headgasket. I'm going to look into that and see if that really is what the problem is.
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Old 08-16-2006, 11:19 AM   #5
BURTONRIDR
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Quote:
Originally Posted by soccer_freak_m@hotma
not to sound like an ass... but...

a. if it was valves it would effected on accel/decel
b. I already said i'm 100% on the timing marks being lined up. if they weren't it'd sound like a diesel.
Sorry I read over that to fast....
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Old 08-25-2006, 03:43 PM   #6
soccer_freak_m@hotma
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Location: Edmonton, Alberta
Default

UPDATE TIME!!!!!

Ok, so I got the CEL pulled and cleared. It was a P0301B Cylinder 1 misfire.

Long and short of it is that when the head was sitting on the ground for doing the headgaskets someone must have hit it and it fell over onto the sparkplug causing what I like to call "a negative spark plug gap condition". Anyway I properly gapped it back out to spec and she runs like a dream.

Hope this helps someone in the future...
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Old 08-25-2006, 03:48 PM   #7
BURTONRIDR
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Member#: 72132
Join Date: Oct 2004
Chapter/Region: NWIC
Location: Spokane, WA
Vehicle:
2000 Legacy GT
White

Default

Quote:
Originally Posted by soccer_freak_m@hotma
UPDATE TIME!!!!!

Ok, so I got the CEL pulled and cleared. It was a P0301B Cylinder 1 misfire.

Long and short of it is that when the head was sitting on the ground for doing the headgaskets someone must have hit it and it fell over onto the sparkplug causing what I like to call "a negative spark plug gap condition". Anyway I properly gapped it back out to spec and she runs like a dream.

Hope this helps someone in the future...

LOL the little details that we miss.... Right on dude glad you got that problem fixed
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