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Old 07-14-2012, 09:53 PM   #1
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P0300 Random Cyl. Misfires with new IM?

O.K. guys-
I've put this thing on twice now

I was attempting to swap to a ported IM with Rx 3/8th's spacer from my OE IM with a Mace, and I'm getting frustrated . I also added Mace's plenum spacer.

The first time I figured I just was too stingey with the gasket maker. Car starts but almost immediately begins to buck and idle very rough- will die if no gas is given.

After 2nd install, I got the same result.

I was figuring its an airleak- but now I dunno .

Anyone seen this? Help!!:(
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Old 07-14-2012, 09:57 PM   #2
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Check for vacuum leaks.
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Old 07-14-2012, 11:58 PM   #3
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Are you only using an OEM gasket on 1 side or both for the manifold?
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Old 07-15-2012, 12:03 AM   #4
nikos30
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from top to bottom, this is what I have.
plenum cover
those 4 little thing that mace sent
oem gasket for the 4 inner holes
plenum spacer
oem gasket for the plenum
plenum spacer
rtv gasket maker
ported intake manifold
rtv gasket maker
insulator
oem gasket
cylinder heads
...I think this is right. Make sure those 4 little things that mace sent are still there, or else that means it went through.
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Old 07-15-2012, 12:38 AM   #5
Cyber Gray
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Quote:
Originally Posted by Ventmaster View Post
O.K. guys-
I've put this thing on twice now

I was attempting to swap to a ported IM with Rx 3/8th's spacer from my OE IM with a Mace, and I'm getting frustrated . I also added Mace's plenum spacer.

The first time I figured I just was too stingey with the gasket maker. Car starts but almost immediately begins to buck and idle very rough- will die if no gas is given.

After 2nd install, I got the same result.

I was figuring its an airleak- but now I dunno .

Anyone seen this? Help!!:(
It is Vaccum leak man

It is not how much you apply of the gasket maker, it is more what type you are using, where you place it and for how long.

My car has started perfectly for half an hour before the gasket maker failed. I didnt leave it to cure .

Im waiting for the OEM gasket to arrive tommorow and re-do the whole job again.

Jay has advised me to check the leak by spraying brake cleaner near the gaskets. I will do that just to determine where exactly my RTV has failed.
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Old 07-15-2012, 12:45 AM   #6
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Quote:
Originally Posted by Cyber Gray View Post
It is Vaccum leak man

It is not how much you apply of the gasket maker, it is more what type you are using, where you place it and for how long.

My car has started perfectly for half an hour before the gasket maker failed. I didnt leave it to cure .

Im waiting for the OEM gasket to arrive tommorow and re-do the whole job again.

Jay has advised me to check the leak by spraying brake cleaner near the gaskets. I will do that just to determine where exactly my RTV has failed.
I'm gonna give it a go w/ permatex right stuff when I get my manifold and spacer. That stuff sets in a 5 mins, and is advertised to be applied and drive away sturdy.
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Old 07-15-2012, 02:47 AM   #7
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make sure you've attached all the hoses back on as well. i forgot the brake booster hose on the rear drivers side once and was like "WTF?! ...oh, im an idiot". just something to think about.
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Old 07-15-2012, 05:11 AM   #8
Cyber Gray
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Originally Posted by Untouchable Keeve View Post
I'm gonna give it a go w/ permatex right stuff when I get my manifold and spacer. That stuff sets in a 5 mins, and is advertised to be applied and drive away sturdy.
Its good and bad at the same time. Good because it settles easily. But bad since it doesnt allow you much time to correct any mistakes.

So you have to be careful and accurate
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Old 07-15-2012, 07:04 AM   #9
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Quote:
Originally Posted by nikos30 View Post
from top to bottom, this is what I have.
plenum cover
those 4 little thing that mace sent
oem gasket for the 4 inner holes
plenum spacer
oem gasket for the plenum
plenum spacer
rtv gasket maker
ported intake manifold
rtv gasket maker
insulator
oem gasket
cylinder heads
...I think this is right. Make sure those 4 little things that mace sent are still there, or else that means it went through.
Ditto- this is my set-up also.

Yes, at first start-up I left a single small box wrench sitting on the metal apron at the nose of the car w/hood closed.

That wrench started to rattle and I had visions of an aluminum spacer playing pinball in the valve train!! Just about threw up in the car- then the engine died. Man I thought I'd screwed the Pooch!

All spacers were in place, thankfully, and I went back thru adding gasket maker to all surfaces (sparingly). Gave it more than 24hrs to cure, and still got the same result... All hoses quadruple checked.

I'm suspecting perhaps those spacers have too small an opening to let those little black plastic liners in the plenum lid to seat. perhaps this is part of my leak? Will use the brake cleaner spray next start-up- Thanks Cyber.

Guess I'm gonna get to do this a third time- not fun.
I may go back to my good'ol Mace- never had an issue there.

Thanks for the help and re-assurance guys- any other input is appreciated.
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Old 07-15-2012, 09:22 AM   #10
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I had to RTV the manifold gasket to the 25mm spacer to get rid of my vaccum leak.
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Old 07-15-2012, 09:42 AM   #11
formare
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Wasn't Jay experiencing the exact same problem with his car causing Jim to sale it. Hmmmmm.
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Old 07-15-2012, 09:49 AM   #12
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Quote:
Originally Posted by hapisok View Post
make sure you've attached all the hoses back on as well. i forgot the brake booster hose on the rear drivers side once and was like "WTF?! ...oh, im an idiot". just something to think about.
My buddy and I forgot to attach the MAF sensor and it took us a few minutes to figure out why the car was just dying after starting it.
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Old 07-15-2012, 11:31 AM   #13
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Quote:
Originally Posted by formare View Post
Wasn't Jay experiencing the exact same problem with his car causing Jim to sale it. Hmmmmm.
I think Jay's was actually backfiring loudly, mines just a stumbling idle that eventually just quits running without some coaxing.

I know its gotta be an airleak/vacuum leak somewhere, but I've tried all the cures mentioned so far.

I'm getting stumped
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Old 07-15-2012, 11:40 AM   #14
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It sounds like you're definitely checking all the right things, I doubt one insulator would cause this while the other would not - maybe try OEM gaskets on both sides and skip the RTV altogether?
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