Help Please

chrispgh95 · 04-22-2004, 05:21 PM

HI ALL,

Wondering if someone can help me.. 95 ex 4.0 ohv engine... Today will driving on the highway i noticed a little surge in driving felt almost like the tranny slipping.... But i noticed that wasnt the case.. Well i turned it off parked and came back.. i rolled down the windows and reved it up.. sounded like a have a hole in the exhaust underneath me or the passanger side, i very low rumble.. But would this cause the ex to surge like this i noticed it more when coming from a complete stop... any help appreicated....

THX

Chris

MrShorty · 04-22-2004, 05:52 PM

An exhaust leak upstream of the O2 sensor can let excess O2 from the air in, which causes false O2 sensor readings and causes the computer to screw up the air/fuel mixture.

chrispgh95 · 04-22-2004, 05:58 PM

When you say upstream of the sensor do you mean manifold area?

MrShorty · 04-22-2004, 10:40 PM

If I remember right, '95 has 2 O2 sensors: 1 in the passenger exhaust piping somewhere before the junction in the Y-pipe, and another just past the junction in the Y-pipe. Any leak upstream of one or both of these sensors is what I'm talking about. Could be exhaust manifold or the y-pipe itself.

04-22-2004, 05:21 PM	#1
chrispgh95 Wannabe Elite Explorer Pgh , PA 95 XLT Join Date: Aug 2003 Posts: 36 Vehicle Specs (Original Poster)	Help Please HI ALL, Wondering if someone can help me.. 95 ex 4.0 ohv engine... Today will driving on the highway i noticed a little surge in driving felt almost like the tranny slipping.... But i noticed that wasnt the case.. Well i turned it off parked and came back.. i rolled down the windows and reved it up.. sounded like a have a hole in the exhaust underneath me or the passanger side, i very low rumble.. But would this cause the ex to surge like this i noticed it more when coming from a complete stop... any help appreicated.... THX Chris

04-22-2004, 05:52 PM	#2
MrShorty Wannabe Elite Explorer Spanish Fork, UT 92 XLT and '87 Bronco II Join Date: Dec 2001 Posts: 4,934 Vehicle Specs	An exhaust leak upstream of the O2 sensor can let excess O2 from the air in, which causes false O2 sensor readings and causes the computer to screw up the air/fuel mixture. __________________ Mr. Shorty 92 XLT 4x4 87 Bronco II XLT 4x4 '98 Chev K1500 Suburban SLT 4x4

04-22-2004, 05:58 PM	#3
chrispgh95 Wannabe Elite Explorer Pgh , PA 95 XLT Join Date: Aug 2003 Posts: 36 Vehicle Specs (Original Poster)	Help Please When you say upstream of the sensor do you mean manifold area?

04-22-2004, 10:40 PM	#4
MrShorty Wannabe Elite Explorer Spanish Fork, UT 92 XLT and '87 Bronco II Join Date: Dec 2001 Posts: 4,934 Vehicle Specs	If I remember right, '95 has 2 O2 sensors: 1 in the passenger exhaust piping somewhere before the junction in the Y-pipe, and another just past the junction in the Y-pipe. Any leak upstream of one or both of these sensors is what I'm talking about. Could be exhaust manifold or the y-pipe itself. __________________ Mr. Shorty 92 XLT 4x4 87 Bronco II XLT 4x4 '98 Chev K1500 Suburban SLT 4x4