355 No Power, Shakes.

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Mar 3, 2010 | 02:33 PM

sepno77

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355 No Power, Shakes.

I'm posting this for my brother. He has a 1995 M6 355 w/ 503 cam.

Problem: Car is down on HP and engine shakes in 5th and 6th gear.

New parts:
Opti
Wires
Plugs
ICM

Anyone have any ideas or suggestions?

Last edited by sepno77; Mar 3, 2010 at 03:29 PM.

Mar 3, 2010 | 02:39 PM

RamAir95TA

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Any codes? Could be a ton of things really. Start by checking fuel pressure.

Mar 3, 2010 | 02:49 PM

sepno77

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Thats what's making it so hard to fix. Code tester isn't connecting to the PCM. Will check the fuel pressure once we get a fuel pressure tester handy.

Mar 3, 2010 | 03:13 PM

AChotrod

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All the wires in the correct firing order? Made sure they didnt get burned?

Mar 3, 2010 | 03:58 PM

sepno77

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Wires are brand new and in the correct order.

Mar 3, 2010 | 04:14 PM

djjab57

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I would check again to make sure one didnt get burnt, Ive done it but you dont think thats it cause there new

Mar 3, 2010 | 04:15 PM

djjab57

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Happen 3 times to me LOL 2nd one on passenger side

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Mar 3, 2010 | 07:42 PM

jaycenk

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is it only in 5th or 6th gear?

Mar 3, 2010 | 08:44 PM

#10

sepno77

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well its the most noticable at low speeds. 40-50mph. His car should be pushing at least close to what I am and its no where near at the momoent w/ this bug.

Mar 4, 2010 | 11:11 AM

#11

sepno77

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FOUND THE PROBLEM!
Cylinder # 8 spark plug was covered in oil.

What could cause this?
Piston Rings?
Valve seals?

His car has a new felpro intake mani gasket.

Mar 4, 2010 | 11:13 AM

#12

RamAir95TA

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Uh, what was the problem?

Mar 4, 2010 | 11:28 AM

#13

sepno77

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Cylinder # 8 spark plug was covered in oil.

Mar 4, 2010 | 11:40 AM

#14

RamAir95TA

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An oil-coated spark plug could be a couple things, like valve seals, guides, rings, etc., but if it's only the one plug (assuming the other 7 are fine), it's probably a poorly installed intake manifold gasket.

Mar 4, 2010 | 11:47 AM

#15

sepno77

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Well I'm not 100% sure but I think it dose it on other cylinders just not as bad.

Mar 4, 2010 | 11:58 AM

#16

RamAir95TA

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Did he pull any other plugs!?

Mar 4, 2010 | 02:10 PM

#17

sepno77

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He said the rest are fine. He ran a compression test and that checks out fine as well.

Mar 4, 2010 | 02:37 PM

#18

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check them all when your in there to save yourself time in the long run. I personally do not like doin things twice either way glad you found the fix.

Mar 4, 2010 | 06:48 PM

#19

sepno77

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Well turns out once he put a new plug in it, It started runing strong from what I was just told.

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355 No Power, Shakes.

355 No Power, Shakes.

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