Skip the auto shop - Our mechanics make house calls

Q: Goes rich fuel? Not sure what to do

asked by on

Hello!

Nissan 350z, made BIG engine repair. (crankshaft, connecting rods, piston rings, timing chain). Now when i start car it shows misfire engine code, iv checked and replaced: plugs, ignition coils and lambda sensors. No air leaks. Rich fuel smell, and big white exhaust clouds.

SO: when i start up its run nice and all 6 work, after 10seconds one/multiple goes off and it drops from 1000 to around 600. When i try to press acceleration it takes a second to react and goes slowly up, like no horsepowers at all. I cant move from 2nd gear, it just shut down.

If you can help, i would be really thankfull!!
My car has a manual transmission.

A: Hi there: Anytime you have major engine re...

Hi there:

Anytime you have major engine repairs completed on newer vehicles, it’s vital to reprogram the ECU to allow the computer to recognize the changes made and reduce the potential of error codes appearing (and the rich engine situation you’re experiencing). You will most likely have to get this service completed by the dealership, as it’s becoming more difficult to have professional mechanics reprogram or replace ECU’s due to restrictions put forth by the manufacturers. If the dealership can’t help you here, contact one of our mobile mechanics to complete a car is hard to start inspection; so they can determine your best course of action.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I adjust the side ventilators?

The side ventilators can be adjusted to control the direction and flow of the air. Manually adjust the ventilators by rotating them, and folding them open or closed.

Q: Check engine light is flashing and reduces the power of the engine.

If the light is flashing then the computer system should have stored codes as to why the problem is happening. I recommend having the computer scanned by a certified technician, such as one from YourMechanic, to retrieve the codes and...

Q: Accessory / Ignition Power is inconsistent

Hello there, thank you for asking about your 2004 Nissan 350Z. This is a commonly known issue with the 350Z. You should have a Check Engine Light on when this happens which will be likely related to NATS computer codes....

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.