Injector Knock?? - Competition Diesel.Com

SmokenIDI · 01-12-2013, 04:44 PM

I cant tell if my truck has an injector knock or if its a rod knockin. i was told the previous owner who put the turbo on my 7.3 didnt put turbo injectors on it so im assuming they are stock 7.3 idi non turbo injectors. the knock is there almost all the time...when it warms up out side it tends to go away...some times the knock is there and sometimes its not. i dont know if a rod knock will come and go...but ive never had an injector knock before so i do not know if that will come and go either...i have noticed that it will occasionally miss...im new to the IDI so i have no clue whats going on. it still runs good and seems to have power. anybody got ideas? do they make performance injection pumps and injectors?

*lenahan05* · 01-12-2013, 04:52 PM

every IDI ive ever drove or worked on had a helluva knock unless it was up to temp.

91dirtydiesel · 01-12-2013, 05:12 PM

What's your timing at? If you put your finger on the lines can you feel one "knock" more than the rest? If you loosen the injector cap does said "knock" go away?

SmokenIDI · 01-12-2013, 05:25 PM

It is really annoying. especially because its there 95% of the time...i was gonna get some turbo injectors for it and see if that does anything for it. i hope to god it does cuz i dont have the funds right now to pull the motor and replace or rebuild at the moment. trying to buy a house soon. haha

SmokenIDI · 01-12-2013, 05:27 PM

Quote:

Originally Posted by 91dirtydiesel

What's your timing at? If you put your finger on the lines can you feel one "knock" more than the rest? If you loosen the injector cap does said "knock" go away?

i have not tryed that yet. i will try that here in just a minute...

SmokenIDI · 01-12-2013, 05:32 PM

i do not know what my timing is at. i havent checked that yet.

91dirtydiesel · 01-12-2013, 05:38 PM

Quote:

Originally Posted by SmokenIDI

It is really annoying. especially because its there 95% of the time...i was gonna get some turbo injectors for it and see if that does anything for it. i hope to god it does cuz i dont have the funds right now to pull the motor and replace or rebuild at the moment. trying to buy a house soon. haha

Turbo specific injectors make zero difference. They are all rebuilds basically at this point. Finding a good quality matched set would quiet it down...if it is infact injector related. Any "popping" from intake or exhaust? I'd check timing first and put a hefty dose of ATF in the fuel filter, run it for a tad then let it sit overnight

SmokenIDI · 01-12-2013, 05:42 PM

no popping from the exhaust at all. its gonna suck if its a friggin rod knock. but how much atf would you put in it. i will have the timing cover off of it soon. i have a nice oil leak coming from the timing cover gasket.

SmokenIDI · 01-12-2013, 05:48 PM

it does have some blow by but the coolant is still green and it runs cool. so i dont have any coolant in my oil.

LuckyLegs · 01-12-2013, 06:18 PM

Quote:

Originally Posted by SmokenIDI

I cant tell if my truck has an injector knock or if its a rod knockin. i was told the previous owner who put the turbo on my 7.3 didnt put turbo injectors on it so im assuming they are stock 7.3 idi non turbo injectors. the knock is there almost all the time...when it warms up outside it tends to go away...some times the knock is there and sometimes its not. i dont know if a rod knock will come and go...but ive never had an injector knock before so i do not know if that will come and go either...i have noticed that it will occasionally miss...im new to the IDI so i have no clue whats going on. it still runs good and seems to have power. anybody got ideas? do they make performance injection pumps and injectors?

do you sometimes warm it up inside?

sorry, couldnt resist

SmokenIDI · 01-12-2013, 06:24 PM

cant feel the knock in the fuel lines...so im guessing its probably a rod knock....

91dirtydiesel · 01-12-2013, 06:25 PM

Play with your timing, see if the "knock" changes. And see if loosening injector cap stops the noise from what ever cylinder you find by feeling lines

SmokenIDI · 01-12-2013, 06:25 PM

Quote:

Originally Posted by LuckyLegs

do you sometimes warm it up inside?

sorry, couldnt resist

when the temp out side warms up. sorry.

91dirtydiesel · 01-12-2013, 06:27 PM

Quote:

Originally Posted by SmokenIDI

cant feel the knock in the fuel lines...so im guessing its probably a rod knock....

Stop saying that lol now loosen each one at a time to pinpoint the cylinder. And play with timing.

SmokenIDI · 01-12-2013, 06:28 PM

how do you adjust the timing on this? i know with a gas engine you play with the distributor...but im new to the diesel world so im not quite sure how do to it to a diesel.

91dirtydiesel · 01-12-2013, 06:30 PM

You twist injection pump

SmokenIDI · 01-12-2013, 06:50 PM

ahh. i will try that once the rain dies down here in a bit.

91dirtydiesel · 01-12-2013, 06:59 PM

Don't do it while engine is running. And only turn 1/16" or 1/8" at a time

SmokenIDI · 01-12-2013, 09:48 PM

Alright man. thanks. ill let you know what i find out.

SmokenIDI · 01-16-2013, 09:46 AM

So i havent messed with the timing yet, but on my way home the other night i hit a bump in the road....the knock stopped and my oil pressure went back up to the N in the normal range (it has always read on the lowest side of the normal range) and ran fine until i started it back up the next morning and the knock was back and my oil pressure was real low again.

01-12-2013, 04:44 PM	#1
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	Injector Knock?? I cant tell if my truck has an injector knock or if its a rod knockin. i was told the previous owner who put the turbo on my 7.3 didnt put turbo injectors on it so im assuming they are stock 7.3 idi non turbo injectors. the knock is there almost all the time...when it warms up out side it tends to go away...some times the knock is there and sometimes its not. i dont know if a rod knock will come and go...but ive never had an injector knock before so i do not know if that will come and go either...i have noticed that it will occasionally miss...im new to the IDI so i have no clue whats going on. it still runs good and seems to have power. anybody got ideas? do they make performance injection pumps and injectors?

01-12-2013, 04:52 PM	#2
lenahan05 Name: lenahan05 Title: Comp Diesel Sponsor Status: Not Here Join Date: Jan 2009 Location: Terre Haute, Indiana Member`s Gallery Posts: 1,173	every IDI ive ever drove or worked on had a helluva knock unless it was up to temp.

01-12-2013, 05:12 PM	#3
91dirtydiesel Name: 91dirtydiesel Title: IDIot Status: Not Here Join Date: Jan 2012 Location: wa Member`s Gallery Posts: 461	What's your timing at? If you put your finger on the lines can you feel one "knock" more than the rest? If you loosen the injector cap does said "knock" go away?

01-12-2013, 05:25 PM	#4
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	It is really annoying. especially because its there 95% of the time...i was gonna get some turbo injectors for it and see if that does anything for it. i hope to god it does cuz i dont have the funds right now to pull the motor and replace or rebuild at the moment. trying to buy a house soon. haha

01-12-2013, 05:32 PM	#6
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	i do not know what my timing is at. i havent checked that yet.

01-12-2013, 05:42 PM	#8
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	no popping from the exhaust at all. its gonna suck if its a friggin rod knock. but how much atf would you put in it. i will have the timing cover off of it soon. i have a nice oil leak coming from the timing cover gasket.

01-12-2013, 05:48 PM	#9
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	it does have some blow by but the coolant is still green and it runs cool. so i dont have any coolant in my oil.

01-12-2013, 06:24 PM	#11
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	cant feel the knock in the fuel lines...so im guessing its probably a rod knock....

01-12-2013, 06:25 PM	#12
91dirtydiesel Name: 91dirtydiesel Title: IDIot Status: Not Here Join Date: Jan 2012 Location: wa Member`s Gallery Posts: 461	Play with your timing, see if the "knock" changes. And see if loosening injector cap stops the noise from what ever cylinder you find by feeling lines

01-12-2013, 06:28 PM	#15
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	how do you adjust the timing on this? i know with a gas engine you play with the distributor...but im new to the diesel world so im not quite sure how do to it to a diesel.

01-12-2013, 06:30 PM	#16
91dirtydiesel Name: 91dirtydiesel Title: IDIot Status: Not Here Join Date: Jan 2012 Location: wa Member`s Gallery Posts: 461	You twist injection pump

01-12-2013, 06:50 PM	#17
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	ahh. i will try that once the rain dies down here in a bit.

01-12-2013, 06:59 PM	#18
91dirtydiesel Name: 91dirtydiesel Title: IDIot Status: Not Here Join Date: Jan 2012 Location: wa Member`s Gallery Posts: 461	Don't do it while engine is running. And only turn 1/16" or 1/8" at a time

01-12-2013, 09:48 PM	#19
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	Alright man. thanks. ill let you know what i find out.

01-16-2013, 09:46 AM	#20
SmokenIDI Name: SmokenIDI Title: Rookie Status: Not Here Join Date: Dec 2012 Location: Indiana Member`s Gallery Posts: 18	So i havent messed with the timing yet, but on my way home the other night i hit a bump in the road....the knock stopped and my oil pressure went back up to the N in the normal range (it has always read on the lowest side of the normal range) and ran fine until i started it back up the next morning and the knock was back and my oil pressure was real low again.