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Having problems running on petrol. runs fine on gas but wont…

Customer Question
Having problems running on...

Having problems running on petrol. runs fine on gas but wont do any more than an idle on petrol. its a 94 model with a 4.2 litre petrol motor

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

No runs normal on gas. and has trouble starting on fuel

Mechanic's Assistant: What is the model of your '94 Nissan?

St patrol

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Yes. ive checked the fuel pump for correct operation and pressure, replaced the fuel filter, not sure how to check the throttle possition sensor. it makes no change if i unplug it though

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Thats all i can think of for now

Submitted: 5 months ago.Category: Nissan
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Answered in 3 hours by:
11/23/2017
Nissan Mechanic: Greg, import technician replied 5 months ago
Greg
Greg, import technician
Category: Nissan
Satisfied Customers: 7,347
Experience: import Technician . Shop Owner ,. 27 years experience,
Verified
What was the petrol fuel pressure .You got fuel injection or a carburetor.
Greg
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Customer reply replied 5 months ago
What i done was to put a high pressure inline pump in n it made no difference n its injected
Nissan Mechanic: Greg, import technician replied 5 months ago
Fuel injection or carburetor.
You have a fuel issue for sure as the engine runs well on LPG.
Greg
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Customer reply replied 5 months ago
hi Greg, just wondering if a slightly broken bottom half of the aircleaner box would make a difference. it seems to run ok if i restrict the airflow
Customer reply replied 5 months ago
i have also checked for vacuum leaks and found none. if i restrict approx 30 to 40% of the airflow it seems to be ok. any suggestion why???
Nissan Mechanic: Greg, import technician replied 5 months ago
Hi .
I need to know if you have a fuel injectors or carburetor??
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Customer reply replied 5 months ago
Fuel injectors
Nissan Mechanic: Greg, import technician replied 5 months ago
Ok good now did you check for any malfunction codes.
Greg
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Customer reply replied 5 months ago
Havent done yet but will first thing monday morn
Nissan Mechanic: Greg, import technician replied 5 months ago
Ok good let me know what you find ,
Have a great weekend.
Greg
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