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Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 21246
Experience:  BEng hons Mech engineering, in auto industry 22 years
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My 2005 nissan murano had transmission and engine

Customer Question

My 2005 nissan murano had transmission and engine replaced..since then the car had a slow accelration ..then I got it out the catletic convertor with no help...I am not sure where to start..
Submitted: 1 year ago.
Category: UK Car
Customer: replied 1 year ago.
In addition, the car cut off on the highway for a second, but the engine was running. also, it cranks a lot before starting when it is hot..I hope this will help you iditfify the problem
Expert:  Matt replied 1 year ago.

Hello

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this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.

If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,

Ideally measure the pressure at the injectors and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

if you're at all unsure of the engine's history then I'd also do a compression check across all cylinders

as they should all be within 10-15psi of each other

if these 2 are OK then I'd next check that you're getting full throttle

by removing the intake and with the ignition on and your engine off have your assistant press slowly down on the accelerator pedal and watch the throttle butterfly as it should open smoothly and slowly with no jerks

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Customer: replied 1 year ago.
But when the car goes over 60-70km/h then it response ok, you still think its fuel issue, what about the vacuum system
Customer: replied 1 year ago.
Please keep in mind the marked catalytic converter were removed from the car by opening the catalyst case and removing the inside metallic honeycomb filter, since then the Engine warning light remains on, I believe due to different reading of the O2 sensor.
Expert:  Matt replied 1 year ago.

thanks for the extra information

yes you will create a fault code / check engine light by removing the cat as the ECU will be looking for it to have some effect

so if the light is on then its likely to be in limp home and this will stop the VVT from working which would explain the lack of performance

I'd suggest getting an ECU re-tune to remove the diagnostic code that is causing the issue

try

http://www.quantumtuning.co.uk/quantum-dealers.aspx

Customer: replied 1 year ago.
The car suttdown completely this morning while I was driving on 20_30 ..I had to restarted again...could pleae explain what is the VVT you mentioned in u previous responce.In addition, a buyer took my car last night to his mechanic and he said my gear is going bad and have low pressure...I don't know how he figured that out...
Expert:  Matt replied 1 year ago.

Hello

the VVT = variable valve timing where the camshafts move to change the engine tuning

so I'd say the net step is to get the fault codes read off to direct the repairs

as for the transmission being bad this is difficult to diagnose from the drivers seat and could be any number of other things so getting a diagnostic doen with dealer level kit will really help

Expert:  Matt replied 1 year ago.

Hi

do you still need help?

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