92 Maxima running rough when hot

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Ray Greene - 19 Aug 2008 02:39 GMT

My Maxima has started running roughly when it has warmed up. It's fine
when cold. When it's idling I can smell a little raw fuel in the
exhaust.

I replaced the spark plugs and none of them look like it's been
running too rich.

I was going to start replacing the coil, plug leads and distributor
cap but I thought I would check in here first before I start spending
money on it.

Any suggestions on what it might be?

Signature

Ray Greene

** Posted from http://www.teranews.com **

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silverhammer - 19 Aug 2008 14:04 GMT

> My Maxima has started running roughly when it has warmed up. It's fine
> when cold. When it's idling I can smell a little raw fuel in the
[quoted text clipped - 13 lines]
>
> ** Posted fromhttp://www.teranews.com**

Hi Ray,

Just went through a similar experience with my '91.

I replaced the oxygen sensor on the exhaust manifold and the mass air
flow sensor near the air filter & now it's running like a champ. I
used
a remanufactured MAF sensor I got online for about $150. It's a good
idea to blast the O2 sensor with penetrating oil for a few days
before
you try to remove . . . it can be really stubborn. If you want to
experiment, you could clean your current O2 sensor & put it back in to
look for improvement. If it does run better, you probably would want
to replace it.

Best of luck!

Silverhammer

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Ray Greene - 19 Aug 2008 21:52 GMT

>Hi Ray,
>
[quoted text clipped - 14 lines]
>
>Silverhammer

Thanks for the advice Silverhammer, I'll give that a try.

Signature

Ray Greene
** Posted from http://www.teranews.com **

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AS - 20 Aug 2008 00:48 GMT

I never used any fuel additives, but after an old timer friend of mine
mentioned a fuel additive called Sea Foam, I used it in his 83 280ZX.
The results were great. His car had been running rich and after the sea
foam, the engine went back to purring like a nice kitty.

Good luck,

AS

> My Maxima has started running roughly when it has warmed up. It's fine
> when cold. When it's idling I can smell a little raw fuel in the
[quoted text clipped - 8 lines]
>
> Any suggestions on what it might be?

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