Vacuum problem??
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Vacuum problem??
'98 Mazda P/U 3.0 litre w/40k miles.....
Purrs like a kitten at idle, but bogs down when depressing the acc. pedal (like not enough fuel). When doing so, I hear a short whistling sound, but can't locate precicely. It sounds like it's coming from the top-rear of the engine. Not driveable, any suggestions?
Have replaced fuel filter and DPFE sensor thus far (per common problems w/this vehicle). I can hear the fuel pump engaging and I have no CEL so far.
Purrs like a kitten at idle, but bogs down when depressing the acc. pedal (like not enough fuel). When doing so, I hear a short whistling sound, but can't locate precicely. It sounds like it's coming from the top-rear of the engine. Not driveable, any suggestions?
Have replaced fuel filter and DPFE sensor thus far (per common problems w/this vehicle). I can hear the fuel pump engaging and I have no CEL so far.
Last edited by user 609870820894; Apr 8, 2004 at 10:22 PM.
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Joined: Apr 2003
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From: Oregon
It is funny you should have this problem as I just fixed mine today. It was doing the same thing. It ran great at idle but when running at a steady state or under very slight acceleration it would stumble. I ran it this way for about 4 weeks and the CEL finally came on. The codes suggested that my upstream oxygen sensor was having problems. I went to NAPA auto parts, bought an O2 sensor for $55, and put one on tonight and it took care of the problem. I am glad that it worked! Maybe this will help you. However, you may indeed have a vacuum leak which will do the same thing. Good luck.
John
PS My pickup had 55,000 miles on it.
John
PS My pickup had 55,000 miles on it.
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Originally Posted by TotallyRoosted
fuel pressure regulator?
JOe
JOe
Yes, I was thinking the same thing, Joe. Unfortunately, the regulator on mine is in the tank and not servicable by itself -- must be replaced along w/the fuel pump assembly. I was hoping for something less drastic.
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Originally Posted by jcandrew
It is funny you should have this problem as I just fixed mine today. It was doing the same thing. It ran great at idle but when running at a steady state or under very slight acceleration it would stumble. I ran it this way for about 4 weeks and the CEL finally came on. The codes suggested that my upstream oxygen sensor was having problems. I went to NAPA auto parts, bought an O2 sensor for $55, and put one on tonight and it took care of the problem. I am glad that it worked! Maybe this will help you. However, you may indeed have a vacuum leak which will do the same thing. Good luck.
John
PS My pickup had 55,000 miles on it.
John
PS My pickup had 55,000 miles on it.
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Joined: Apr 2003
Posts: 132
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From: Oregon
Maknoll, glad to hear that you got the problem fixed! Don't you love it when you are able to resolve something like that yourself. 
For future reference, what did you unplug to correct the problem? Thanks!
For future reference, what did you unplug to correct the problem? Thanks!
