New Member ask's about knocking

2200 Views 4 Replies 5 Participants Last post by Javier, Oct 8, 2003

I-RODEO

Discussion Starter · Sep 27, 2003

Hello All. I am new to the forum. Actually, I only began searching for an ISUZU forum today. PLANETISUZOO, so far, seems the most promising on the net.

In my search today I have read both positive and negative stories about Isuzu and Isuzu products. I guess I am one of the lucky one's. I own a 95 Isuzu Rodeo, 3.2L V6 with 144K miles on it and have had relatively good luck with it. It has been a great vehicle through the years but these days we just use it as a second vehicle for commuting around in.

My question today revolves around the knocking noise coming from under the hood. This has been a recurring problem through the years. Typically, a trip to the service station for a full fuel system cleaning/treatment process does the trick. However, these treatments do not seem to last as long as they use too.

Our maintenance record on the vehicle is good. There still seems to be plenty of power under the hood (no apparent loss of compression). Just that dang TAP, TAP, TAPPING that keeps coming back time and again.

I have read about knock sensors, O2 sensors, etc... Is there any performance value in replacing these sensors that may help me rid the knocking blues?

Thanks,

I-Rodeo

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JTK

· #2 · Sep 27, 2003

This is a very common issue with the pre 1998 isuzu 3.2's :roll: . It's due to the hydraulic valve lash adjusters. It's annoying but usually not harmfull. Here's a copy of the TSB from isuzu compliments of ckimbrough18 from the 4x4wire.com isuzu site: http://www.nhtsa.dot.gov/TSBScans/sb614929.pdf

G/luck!
Joel

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jdeal

· #3 · Oct 4, 2003

I had the same problem about two years ago on my 96 Trooper. I tried the oil viscosity change mentioned in the bulletin, with no luck. Someone here suggested mixing SeaFoam oil additive to my oil. After about 3-5 oil changes it's been gone for over a year.

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TxRodeo

· #4 · Oct 6, 2003

jdeal said:
I had the same problem about two years ago on my 96 Trooper. I tried the oil viscosity change mentioned in the bulletin, with no luck. Someone here suggested mixing SeaFoam oil additive to my oil. After about 3-5 oil changes it's been gone for over a year.

Did you put in the Mobil1 each time?

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Javier

· #5 · Oct 8, 2003

I have a 95 Trooper. I believe the noise that you hear is coming from the Arm Rockers. They wont harm the engine at all, the easiest way to get rid of the noise without spending a lot of money replacing the arms rockers is just doing an engine flush and then switch to full synthetic oil. I use Castrol 10w30 full synthetic oil in my car and i runs better specially after the 100K.

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