2001 Honda Passport Low gas mileage and hard to start after

Tiny
JFLOW53
  • MEMBER
  • 2001 HONDA PASSPORT
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 127,000 MILES
I have replaced the timing belt, fuel pump, spark plugs, air filter, EGR valve, and temperature sensor. The engine starts easily when cold. (Check Engine light stays on or flashes off and on when accelerating). After warm up engine is hard to start without lightly pressing the accelerator and lopes at idle occasionally shutting off. I have figured the gas mileage at 13mpg. What can cause these problems and how can they be repaired?
Tuesday, October 27th, 2009 AT 9:11 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi jflow53 and TY for the donation

Just by the CEL coming On and Flashing is an indication of a problem within the engine management system. Go to Autozone and get scanned its a free service this will ID where its coming from and get back with the code/s asap

Could very well be an idle speed controller/valve/motor problem to include the throttle position and mass airflow sensors-or a fuel pressure problem.
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Tuesday, October 27th, 2009 AT 9:40 PM
Tiny
JFLOW53
  • MEMBER
  • 3 POSTS
The trouble codes for the check engine light are P0160 and P0161. What can correct this problem? Will correcting it stop the poor gas mileage and starting problems?
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Wednesday, October 28th, 2009 AT 7:45 PM
Tiny
RASMATAZ
  • MECHANIC
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Those codes are for an oxygen sensors-might be on the lean condition and not switching and computer throwing fuel at it due to its reading lean.

Starting problem could be the caused by a coolant temperature sensor not telling the computer to enrich fuel demand during cold starts before the oxygen sensor goes into closed loop to control fuel mix and also low fuel pressure.

Poor gas mileage can be anything within the vehicle sub-systems.

When the last time it was tuned-up? Maybe you should consider getting it tune.
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Wednesday, October 28th, 2009 AT 8:05 PM
Tiny
JFLOW53
  • MEMBER
  • 3 POSTS
What else is there to replace for a tune-up? I replaced plugs, air filter, coolant temperature sensor, fuel pump with filter, cleaned throttle body. I understand timing is not adjustable. Cold starts aren't much of a problem only when warm.
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Wednesday, October 28th, 2009 AT 9:08 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try cleaning out the mass airflow sensor and the EGR valve and test the throttle position and manifold absolute pressure sensors-
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Wednesday, October 28th, 2009 AT 10:56 PM

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