Replaced injector. The wrong one.
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Senior User
Joined: Nov 2014
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Replaced injector. The wrong one.
Had this noise for 2 months now, driving me crazy. It's only on idle so sounds like it still has some life in it.
Anyhow. Last month I dug under the driver's side cover and didn't find it.
This weekend I did passenger's side and replaced #7.
Yeah I know, I was surprised too. The way 7 was found responsible is by means of unplugging and a stethoscope. 7 sounded noisy to me.
The thing is, the noise stopped when #3 (fires before) and #7(firs directly after 3) were unplugged.
Obviously disappointed but also surprised. The noise it is making is quite loud yet I could barely hear it through stethoscope.
Here is my question: Isn't it weird that #8 is still alive and kicking?
New TC also.
Anyhow. Last month I dug under the driver's side cover and didn't find it.
This weekend I did passenger's side and replaced #7.
Yeah I know, I was surprised too. The way 7 was found responsible is by means of unplugging and a stethoscope. 7 sounded noisy to me.
The thing is, the noise stopped when #3 (fires before) and #7(firs directly after 3) were unplugged.
Obviously disappointed but also surprised. The noise it is making is quite loud yet I could barely hear it through stethoscope.
Here is my question: Isn't it weird that #8 is still alive and kicking?
New TC also.
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Not really. Why would this be surprising? #8 is known for giving false codes and failures on tests, but it doesn't wear out or fail any faster than any other injector.
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I always assumed that since it's in constant fuel starvation it will wear out faster.
Anyhow. I'm replacing #3 with what I pulled from #7 this weekend. These two were the only ones that eliminated the noise when unplugged.
Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
Really? Connect a fuel pressure gauge to the fuel rail port at the end of #8 and see if you observe any sort of fuel flow issue. Watch the gauge under load and you should see that #8 is receiving plenty of fuel.
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the issue isn't fuel starvation but rather air intrusion being forced through the back injector (#8). this causes it to wear faster and fail prematurely
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Post Fiend
Joined: Sep 2003
Posts: 6,096
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From: Mesa AZ
I am curious because I have nearly 2 dozen of these trucks between our business and personal fleet that haven't ever had any of these rumored issues with the #8 injector. We have had to replace an injector here and there but it's a random thing at best. My '99 (which I had nearly since new) has AD sticks in every hole and it's not having any of these issues. It has over 350k miles on it now and still drives great.
The AE injector 'solution' presented by Ford addresses the hydraulic pulse wave effect on the HPO side of the system. And even then, it's such a minor change that it really only makes the engine sound slightly different at idle to quiet customer complaints. There isn't any problem with the fuel side so it wasn't necessary to make any changes on that end.
#8 does not wear faster or fail prematurely compared to any other cylinder.
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Lead Driver
Joined: Sep 2005
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From: Norco,CA
On my 9-98 truck, build date, I had the loud noise at idle also. When going down the road I couldn't hear it but when stopped it was loud. I did replace my #8 and it stopped. I just used other AB injector and it was good. We use to go to Perchanga and park in the lower level parking structure and boy was it loud. So in my case it was #8.
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
Same thing here, I finely just bit the bullet and guessed. And it worked. But please do your own research, I don't want you buying something because I took a change. I never had the valve covers off before this but learned quickly it isn't that bad.
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Update:
After previously replacing #3, I replaced #7 this weekend and it worked!
As for troubleshooting methodology, I found listening to the abnormal click-clak noise was impossible to locate it.
Simply unplugging the injectors on- by-one and locating the loudest tick-tick-tick-tick led me to the worn injector.
The worn one was not tick-tick-tick. Although I expected to hear the 'variable' click clak, I only found the loudest injector that souded like a rhytmic clack-clak-clak-clak.
Thanks to everyone who pitched in.
After previously replacing #3, I replaced #7 this weekend and it worked!
As for troubleshooting methodology, I found listening to the abnormal click-clak noise was impossible to locate it.
Simply unplugging the injectors on- by-one and locating the loudest tick-tick-tick-tick led me to the worn injector.
The worn one was not tick-tick-tick. Although I expected to hear the 'variable' click clak, I only found the loudest injector that souded like a rhytmic clack-clak-clak-clak.
Thanks to everyone who pitched in.
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Senior User
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I feel like you owe it to whoever helped, you know?
That's what makes it wothwhile for folks to type into theor phone keyboards - letting them know their time is valued.
