Fuel Pulse Damper!

2003 donkey · Apr 2, 2014

Is the fuel pulse damper the same on flex fuel as the gas?
I'm having a misfire at idle. I'm thinking that oscillations in the fuel rail could be the cause? Like fuel pulse damper two stiff two dampen "Different fuel pressure" need help! Thanks

Road Angels · Apr 2, 2014

check it out on rockauto.com I believe they are different

Mac · Apr 3, 2014

Really rare to hear of the dampener going bad. Pull the vacuum hose and smell for gas and see if it holds vacuum, 15-17 lbs. Only thing to go wrong with them is the diaphragm rupturing and passing gas to the intake causing overly rich conditions. More likely plugs, wires.
Dave

RonD · Apr 3, 2014

+1 ^^, not the first place to look for a misfire cause.

I would look at the PCV valve hoses, that is a common misfire causing issue on these years now, the hoses start cracking after about 10 years, the under side of the elbows is a good place to find a crack.

Next would be to replace spark plugs and add a can of Seafoam to gas tank to clean injectors.

Misfire only at idle is usually a dirty injector, not spraying fuel but dripping it, or intermittent vacuum leak, or spark plug misfiring

BRUTUS_T_HOG · Apr 3, 2014

2003 donkey said:
Is the fuel pulse damper the same on flex fuel as the gas?
I'm having a misfire at idle. I'm thinking that oscillations in the fuel rail could be the cause? Like fuel pulse damper two stiff two dampen "Different fuel pressure" need help! Thanks

Worn valve seats. Do a compression test and a running compression test. Have you determined which cylinder is misfiring?

2003 donkey · Apr 3, 2014

Is this the correct fuel pressure damper xl5e-9f775-ab

I did a compression/balanced test good! new plugs wires injectors/pulse is good pvc hose is good. Valve stems are leavel no broken springs!

2003 mazda b3000 flex fuel vin v
Is this the correct fuel pressure damper xl5e-9f775-ab ?

Thanks for all the help!

BRUTUS_T_HOG · Apr 3, 2014

A static compression test will not show worn valve seats. A running compression test will. Which cylinder is misfiring?

The fuel pulse dampener is not causing your misfire unless the diaphragm ruptured and is dumping raw fuel into the vacuum line.

2003 donkey · Apr 3, 2014

The misfire is on#5 at idle when it flashes a code. But the misfire is erratic! It gradually gets worse while idleing. Most of the time it's there! Sometimes it not all depends how I drive! Is that pressure damper the right one? xl5e-9f775-ab what do I look for on the needle on the running compression test! Thanks I'm all ears!!

BRUTUS_T_HOG · Apr 3, 2014

Do a normal compression test and get a number. Then start the engine and burp the gauge a couple times. It should pump up it at least half of your compression measurement consistently and quickly. Then when you snap WOT it should reach your full compression measurement instantly. If not you have valve sealing issues.

You can remove the schrader valve from the compression gauge also to get faster readings but I prefer to leave the valve in and just release the pressure and take several measurements.

RonD · Apr 4, 2014

2003 3.0l is close the model years of a TSB about a valve seats coming loose and causing intermittent misfires.

TSB 05-26-3
FORD: 2004-2006 Ranger
ISSUE
Some 2004-2006 Rangers 3.0L-2V "Vulcan" vehicles may exhibit:
- Malfunction indicator lamp (MIL) on with diagnostic trouble codes (DTCs) P0300-P0306 and P0316
- Rough running at various RPM
- Rough idle
- Misfire

ACTION
This may be due to an engine exhaust valve seat recession causing a loss of compression.

'99-'03 3.0l engines seem to have valve seat issues as well, although not specific to exhaust valves.
Because the valves turn and the seats seem to be moving as well it produces an intermittent condition for the misfiring as compression changes.

2003 donkey · Apr 4, 2014

Ok I'm still thinking its the pressure damper! If I touch the rear crossover tube on the injector rail you can feel strong oscillations from the injectors at idle. When I rev the motor the oscillations smooth out and so does the misfire. Is this system super sensitive? 42lb injectors on a small fuel rail. Is this the right part # for fuel pressure damper? xl5e-9f775-ab

Mac · Apr 4, 2014

It's not the damper if it's only one cylinder with the problem. Bad damper passes gas thru the broken diaphragm thru the line to the intake. Could even be a bad injector at that cylinder. I assume not throwing any codes. No idea at all if that's the right number you have posted, get a picture and compare to what you have.
Dave

RonD · Apr 4, 2014

#XL5Z-9F775-AA looks to be the part number, gas or flex fuel

Fuel Pulse Damper!

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