Rough Idle


Old 05-17-04, 12:44 PM
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Rough Idle

I have a 91' Infiniti Q45. Lately my car has been running poorly. Here are the symptoms:

1) Rough idle

2) Black Smoke coming from the exhaust

3) I noticed a hard to describe odor coming from underneath the car, smells like exhaust (catalytic converter?)

4) Poor fuel mileage

5) Lacks power.

I ran diagnostics using the onboard computer and it flashed a 34 code which the book says points to the "Detonation Circuit". Based on what the technical manual says, there are a few most likely culprits:

A) Fuel injectors
B) Spark Plugs
C) Fuel Pump
D) EGR Valve

Does anyone have any ideas?
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Old 05-17-04, 02:21 PM
Join Date: Apr 2002
Location: Pittsburgh,Pa
Posts: 2,417
I would remove the egr and see if it's stuck open.Also check your air filter and look for any hoses that may have come off or be cracked and leaking.
Old 05-17-04, 05:16 PM
Desi501's Avatar
Join Date: Oct 2003
Location: Boynton Beach Florida
Posts: 2,207
A scanner would be very helpful here so you could study the data and look for something out of parameter. You could have a Mass air flow problem, O/2 sensor, fuel pressure regulator or even EGR. There are many things that can give you a rich idle.

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