l98 noise
Thread Starter
Heel & Toe
Joined: May 2011
Posts: 17
Likes: 0
From: Kissimmee Fl
l98 noise
I know this is a shot in the dark without anyone being able to hear it but I have a 91 with 85000 miles and it makes on odd noise its not a knock and ist not the "cheap gas" sound its most noticeable when its echoing off the garage walls or another car it sound like its top end and it really does seem to change alot with engine speed. is this a simple valve adjustment or is my engine getting ready to explode
Last edited by mikeb721; Sep 11, 2011 at 03:43 PM.
Melting Slicks
Joined: Sep 2008
Posts: 2,376
Likes: 111
From: Cherokee National Forest TN
Suggest using a long piece of vacuum or fuel line hose, place an end in one ear & some cotton or ear plug in the other ear. Listen around the engine & try to locate the source of the noise. If you can source the problem area it will be easier to identify the problem.
Burning Brakes
Joined: Nov 2008
Posts: 995
Likes: 1
From: Naples Campania
I have a clicking coming out of my pass side as well. It's incrediably loud. I modified a plastic shot glass to listen though. Drill a hole in the bottom, glue a vaccuum tube to it, then the same thing on the other end.
It was coming from the injector. Loud as hell and I thought it was a valve. It was coming from #4 a little more than the rest. Went away after warm
It was coming from the injector. Loud as hell and I thought it was a valve. It was coming from #4 a little more than the rest. Went away after warm
Race Director
Joined: Feb 2003
Posts: 16,475
Likes: 270
From: Kingman AZ
Cruise-In VII Veteran
Cruise-In VIII
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16
www.fuelinjectorconnection.com
Good weekend project. New at your mileage it as time to replace the injectors anyway. Have someone help you that has done this before. The L98 fuel system is kind of like a Chinese puzzle. You really have to remove a lot of stuff to get to the injectors. You might as well remove the intake manifold while in there and replace the gaskets as they will eventually leak on you. Good time to replace the radiator hoses, spark plug wires and plugs too. Also a great time to upgrade or refinish the valve covers.
It's called "while I have it apart" disease and is quite expensive.
Here is a YouTube how-to video by Sammy Calderone. He does a nice job but you may want to stop and label all the hoses and connectors when you do it.
http://www.youtube.com/watch?v=49WXmzfOy4k
Good weekend project. New at your mileage it as time to replace the injectors anyway. Have someone help you that has done this before. The L98 fuel system is kind of like a Chinese puzzle. You really have to remove a lot of stuff to get to the injectors. You might as well remove the intake manifold while in there and replace the gaskets as they will eventually leak on you. Good time to replace the radiator hoses, spark plug wires and plugs too. Also a great time to upgrade or refinish the valve covers.
It's called "while I have it apart" disease and is quite expensive.
Here is a YouTube how-to video by Sammy Calderone. He does a nice job but you may want to stop and label all the hoses and connectors when you do it.
http://www.youtube.com/watch?v=49WXmzfOy4k
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Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
They all make noise some more than others. its normal
Drove me nuts when I bought my 89 kept readjusting valves pulling my hair out til I replaced them with another set which were even louder lol.
Just the way they are.
Drove me nuts when I bought my 89 kept readjusting valves pulling my hair out til I replaced them with another set which were even louder lol.
Just the way they are.