Any opinions on these Fuel Injectors?

[01sport]

01 E38 117k. I think I have a bad injector. Ran a can of Seafoam which helped a little. Trying to decide on my next step.
BG injector service. $
Remove injectors and send to RC Engineering for cleaning and replace any bad with OE. $
Replace all injectors with OE. $$$$
Buy these Bosch injectors from five o motorsports. $$ Less that half the cost of OE Bosch injectors.

http://www.fiveomotorsport.com/product-search/?v=8165

[Xephius]

I used these guys on my last car. Great service.

http://injector-rehab.com/

John

[m3studio]

I heard on replacing the fuel injectors to also replace the O2 Sensors to get like a million times better mpg's plus a bit better engine performance.

[Xephius]

I heard on replacing the fuel injectors to also replace the O2 Sensors to get like a million times better mpg's plus a bit better engine performance.

Only if your injectors and o2 sensor are shot.

John

[nah2323]

A million times better? D@mn, I gotta get me sum of dem betches....

[Route 66]

If you think these are expensive, a PD Injector for a 2005 Passat TDI is $750.00

[bimmerfixr]

01 E38 117k. I think I have a bad injector. Ran a can of Seafoam which helped a little. Trying to decide on my next step.
BG injector service. $
Remove injectors and send to RC Engineering for cleaning and replace any bad with OE. $
Replace all injectors with OE. $$$$
Buy these Bosch injectors from five o motorsports. $$ Less that half the cost of OE Bosch injectors.

http://www.fiveomotorsport.com/product-search/?v=8165

I have a set of those injectors and I have a set of originals if you are interested. Low miles, less than 10K, on the FiveO injectors, high miles, over 100K on the stock ones.

[Edwin NL]

How do you know or think one is bad?

[01sport]

Hi Edwin,
I have a rough idle when warm, worse when weather is hot. I believe I have exhausted most other possibilities.
fuel pressure is good
fuel filter is good
plugs look OK
swapped out each coil individually with a new one
MAF is good
No vacuum leaks. Confirmed by smoke test.
O2 sensors 17k old.
CPS's new
No codes


I have a set of those injectors and I have a set of originals if you are interested. Low miles, less than 10K, on the FiveO injectors, high miles, over 100K on the stock ones.

What do you think of the FiveO injectors?
Why aren't they in your car?

[bimmerfixr]

What do you think of the FiveO injectors?
Why aren't they in your car?

I had no problems with the FiveO injectors untill I put the headers on, then it seemed as if the engine was running a little on the lean side.

I got a set of 24lb injectors from FiveO and put them in inplace of the 19lb injectors. Now it runs a little on the rich side.

Only reason I worried about it was because we all know these engines develop vacuum leaks and I didn't want the engine to get so lean that the DME couldn't adjust anymore.

[Xephius]

I had no problems with the FiveO injectors untill I put the headers on, then it seemed as if the engine was running a little on the lean side.

I got a set of 24lb injectors from FiveO and put them in inplace of the 19lb injectors. Now it runs a little on the rich side.

Only reason I worried about it was because we all know these engines develop vacuum leaks and I didn't want the engine to get so lean that the DME couldn't adjust anymore.

I would suggest not running anything other than stock sized injectors. While the DME can adjust to the different sized injectors while running in closed loop mode, it can't in open. I will break it down for those who don't know the difference.

Closed Loop: The DME checks the RPM, MAF, temp, O2 sensor and other sensors, then pulses the injectors + or - duration based on the last rotation's readings. So if the last rotation was slightly lean, it will add a little more fuel this time. So on and so on. This makes for a very accurate reading. It also does cool things like anticipate engine needs based on acceleration and other things, but we will keep it simple for now.

Open Loop: The engine ignores most all the sensors on the car and runs a known good fuel map from memory. This normally happens when the car is cold, a sensor error is detected or the car thinks there is anything wrong with the injection or emissions system. This is why it is critical to have stock sized injectors. When the car defaults to open loop, it has no way of knowing the injectors are dumping more or less fuel into the system than what was recalculated by the stored fuel maps. This can lead to detonation and head damage in lean conditions and burnt out cats in rich conditions.

Soooo, unless you get a tune that changes the injector size for the calculation inside the DME you are risking you engine. Just my .02

John

[Route 66]

John, I have heard this from so many technicians. Very well stated.

[01sport]

Thank you for your replies. I have decided that the best course of action is to remove my injectors, send them out for cleaning/testing and replace any bad ones with OE.

[Xephius]

Thank you for your replies. I have decided that the best course of action is to remove my injectors, send them out for cleaning/testing and replace any bad ones with OE.

:clap:clap:clap:clap:clap:clap:clap:clap:clap:clap :clap:clap:clap

[bimmerfixr]

I would suggest not running anything other than stock sized injectors. While the DME can adjust to the different sized injectors while running in closed loop mode, it can't in open. I will break it down for those who don't know the difference.

Closed Loop: The DME checks the RPM, MAF, temp, O2 sensor and other sensors, then pulses the injectors + or - duration based on the last rotation's readings. So if the last rotation was slightly lean, it will add a little more fuel this time. So on and so on. This makes for a very accurate reading. It also does cool things like anticipate engine needs based on acceleration and other things, but we will keep it simple for now.

Open Loop: The engine ignores most all the sensors on the car and runs a known good fuel map from memory. This normally happens when the car is cold, a sensor error is detected or the car thinks there is anything wrong with the injection or emissions system. This is why it is critical to have stock sized injectors. When the car defaults to open loop, it has no way of knowing the injectors are dumping more or less fuel into the system than what was recalculated by the stored fuel maps. This can lead to detonation and head damage in lean conditions and burnt out cats in rich conditions.

Soooo, unless you get a tune that changes the injector size for the calculation inside the DME you are risking you engine. Just my .02

John

Thanks for the information. More than 70K miles with the 24lb injectors, I think I'll stick with them for now.:cool