HAVING HESITATION PROBLEMS OFF IDLE AND WHEN CRUISING AT 60 MPH CAR IS SURGING

1993 Nissan Serena

Tiny

karlandee

March, 2, 2012 AT 10:53 PM

Installed new egr valve, new bpt valve, new egr solinoid and new exhaust temp sensor. Also new oxygen sensor, new plugs, cap, rotor, air filter, new fuel pump and fuel filter, new iacc valve, all new injectors. Problem goes away if I unhook egr valve vacumn hose. It feels like egr is opening too far.

FOUND 1350 RELATED QUESTIONS

93 F150 Hesitates/surges

35 ANSWERS
5 IMAGES

Engine Surging

13 ANSWERS

9 Answers

Tiny

KHLow2008

March, 2, 2012 AT 11:32 PM

EGR seems to be opening too long. Have you tried cleaning the EGR passages?

Tiny

karlandee

March, 2, 2012 AT 11:58 PM

Yes I cleaned all egr passages and checked to make sure I was getting exhaust out of all passages and tubes.

Tiny

KHLow2008

March, 3, 2012 AT 12:08 AM

Something is telling the computer to keep the EGr opened for longer than necessary and it could be the O2 sensor. If the sensor is not OEM, it can cause such problems.

The other thing to check would be the PCM and MAF. Ensure the TPS is working correctly

Tiny

karlandee

March, 3, 2012 AT 12:17 AM

Yesterday I bought a brand new bosch oxygen sensor and the car has alot more power but still hesitates. I will check the tps and maf tommorow, Thankyou, KARL

Tiny

karlandee

March, 3, 2012 AT 1:08 AM

Just installed new tps and adjusted- car runs better and no surging at 60 mph but still hesitates off idle at stop signs.

Tiny

KHLow2008

March, 3, 2012 AT 11:37 AM

Did you clean the throttle body?

Tiny

karlandee

March, 3, 2012 AT 3:52 PM

Yes I cleaned it completly.

Tiny

KHLow2008

March, 3, 2012 AT 4:59 PM

Did you check the ignition timing and valve clearances?

What about the MAF?

Tiny

karlandee

March, 3, 2012 AT 6:18 PM

Timing is set to 10 degrees and vavles have been adjusted, MAF is next on the list. Thankyou for all your help, KARL

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