Fuel injection problems????
Fuel injection problems????
My Q45 is lunging hard and heavy, back and forth. It seems like it's struggling to get fuel at times. I need help on what the problem might be, and how to fix it. Any suggestions and or solutions would be greatly appreciated.....
Re: (Jesda)
yes, bucking. Evrything will be fine, and then it starts bucking back and forth pretty hard. Then it'll drive fine for a mile or two, then back to the bucking...back and forth. I put a bunch of fuel injector cleaner in it today, but it still didn't fix it
Check the MAF harness and the MAF for connectivity and functionality. Also check for dirt and stuff in the MAF. Take a gander at http://www.q45.org for most of your DIY needs.
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maxnix
- Posts: 22627
- Joined: Mon Jul 22, 2002 8:11 pm
- Car: 1995 Infiniti Q45
1995 Infiniti Q45t
2000 Infiniti Q45
Re: (Rokketarm)
BG44K, we hope!Rokketarm wrote: I put a bunch of fuel injector cleaner in it today, but it still didn't fix it
How about a little maintenance history?
Re: (cabal1024)
What is the MAF? Where is it located?
Re: (maxnix)
Is BG44K an error code? As far a maintenance, I just purchased my Q 6 months ago, so I have no idea what's been serviced. Do you think it's my fuel filter, dirty injectors, or fuel pump problem?
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ScottJackson
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- Car: 91 Q45, 92 Q45a, 93 Q45, 79 BMW 635CSi, 95 BMW 540i
Mass Airflow Sensor. It is the cylindrical plastic tube thing attached to the lid of the air filter box and from there the air intake tube (about 4" diameter) goes to the throttle body. It's on the driver's side. It has a wire harness plugged into the top of it which is a little square box on top of the tube.
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ScottJackson
- Posts: 657
- Joined: Fri Mar 26, 2004 6:08 pm
- Car: 91 Q45, 92 Q45a, 93 Q45, 79 BMW 635CSi, 95 BMW 540i
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maxnix
- Posts: 22627
- Joined: Mon Jul 22, 2002 8:11 pm
- Car: 1995 Infiniti Q45
1995 Infiniti Q45t
2000 Infiniti Q45
Re: (Rokketarm)
You need an FSM and TSB, and a few minutes each day to read the previous posts by Q45tech.
Re: (Q_SHIP)
Sometimes it is easy to forget to test the most basic items first. Did you take a fuel pressure reading with a tee'd set-up when the problem happened. If you have consult software set-up, a bad knock sensor will show-up as an erratic retard in timing. It won't necessarily put out a code. If the bucking occurs at a particular point on the throttle movement, you might be looking at a worn TPS. This was a problem that I had. Joe at Scottsdale tells me that the TPS wear out at under 100K.
Re: (Q_SHIP)
Mine are shot, and I don't get anything he is describing.Q_SHIP wrote:Knock sensors
What year is your Q, Rokketarm? Changing teh fuel filter is a good idea in general.
Re: (cabal1024)
Mine were too and I had the same "bucking" he does.cabal1024 wrote:
Mine are shot, and I don't get anything he is describing.
What year is your Q, Rokketarm? Changing teh fuel filter is a good idea in general.
Re: (sdkhalsa)
Sorry guys, I'm a new Q owner, what is a TPS?
Re: (cabal1024)
My Q is a 94, where is the fuel filter located?
Re: (Rokketarm)
Throttle Postioning SensorRokketarm wrote:Sorry guys, I'm a new Q owner, what is a TPS?