1994 Nissan Sentra Engine falter at approximately same RPM

TIJAKE86

MEMBER
1994 NISSAN SENTRA
4 CYL
FWD
AUTOMATIC
143,000 MILES

I've owned the car for the last 120000 miles put on it and kept up with all regular maintenance. The engine was faltering a bit so I started trouble shooting so far I have replaced the plugs, wires, cap, rotor, Air Filter, Mass Airflow Sensor, changed the oil, checked fuel pressure, checked cylinder pressure, checked O2 sensors, and even took it to a dealership to have a complete diagnostic run. The problem still persists. The falter is at about 1,500 rpm I would say making it self apparent on initial take off and while cruising at around 50 mph. Any pointers.

5 Replies

KHLOW2008

MECHANIC
41,814 POSTS

Hi Tijake86,

If your car is equipped with EGR, unplug the vacumn hose and drive the car try to see if you get the problem. The check engine light will come on but nothing to worry about.

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Thursday, June 12th, 2008 AT 9:32 AM

TIJAKE86

MEMBER
4 POSTS

Disconnecting the EGR completely stops the problem. But without the EGR aren't the pistons in serious danger of burning up.

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Thursday, June 12th, 2008 AT 11:45 AM

KHLOW2008

MECHANIC
41,814 POSTS

Hi Tijake86,

That was to check what causes the problem. You won't burn the pistons, but you will fail the emission.

Now that you know, you should try to find out whether the EGR valve or its controlling solenoid is at fault.

Note : An out of adjustment TPS can cause that.

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Thursday, June 12th, 2008 AT 12:09 PM

TIJAKE86