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Check engine light will not illuminate car stalls when shifting into g…

Customer Question
check engine light will not...
check engine light will not illuminate car stalls when shifting into gear
will start after reconnecting battery
Submitted: 3 years ago.Category: Transmissions
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Customer reply replied 3 years ago
200 nissan altima
Customer reply replied 3 years ago
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Customer reply replied 3 years ago
(###) ###-####
Answered in 9 minutes by:
6/17/2015
Transmission Mechanic: Matt, Engineer replied 3 years ago
Matt
Matt, Engineer
Category: Transmissions
Satisfied Customers: 23,469
Experience: Mechanical Engineer BEng Hons22 years experience in car engine industry, 10 years in formula 1
Verified
Hello
This could be an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.
As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.
Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.
The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.
Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.
Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.
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Transmission Mechanic: Matt, Engineer replied 3 years ago
hi
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Matt, Engineer
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