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1995 Mazda B4000 rough idle help!

Tiny
KNLAISU1870
  • MEMBER
  • 1995 MAZDA B4000
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 186,000 MILES
Description of Problem: 1995 Mazda b4000 v6 4x4 rough idle to the point where engine jumps but does not shut off when the accelerator is pushed the problem stops it only happens accelerator is not pressed. At stop lights in park etc. Replaced throttle position sensor and egr pressure sensor and the problem still persists. Could this be the egr valve causing this? Check engine light codes read p0402 p1121 p0102 p0174 p0171
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Thursday, April 23rd, 2015 AT 4:16 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Cold be a bad maf sensor, tp sensor as well as egr partially clogged. Also check fuel pressure with a gauge may be that more though. Also low battery voltage so check for condition including load test most places do for free. Fp should be 54-64 psi
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Sunday, April 26th, 2015 AT 4:21 PM

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