Nervous, Worried, Help Please!

**nfpgasmask** · 05/09/2006, 10:56 AM

OK, so i've had my VX since this past Saturady. 2001 EB with 25,000 miles. Everything is kosher.

Today I drove to work (13 miles, non highway), no issues. Around noon I went out on lunch. I drove to the post office (3 miles away), no issues. When I left the post office, I noticed that the trans was making a hard shift out of first gear. At about 20mph, the truck made a disturbing "clunk", the rpms dropped quick and then everything seemed fine. I went another mile and stopped at a pizza joint for lunch. After lunch, I checked to see if I was leaking anything, negative. So I started her up and drove back to work, with no clunking anymore. I don't get it.

So, could this be a sign of something really bad? Or is this most likely a case of dirty trans fluid? I am going to get this looked at as soon as I can.

Any help from the expert on here would be much appreciated.

Bart

**etlsport** · 05/09/2006, 11:08 AM

you should monitor your TOD display around the times when you feel the differences, it took me a little time to get used to the 4wd adjusting itself, i think there was also a post on here recently about someone having a clunking sound from the rear, maybe youre getting that and its not the trans at all? just do a search for the word 'clunk'

**nfpgasmask** · 05/09/2006, 11:18 AM

Cool, thanks. I found the one you are talking about I think. So far, this has been sporatic, so maybe it is the "mode selector" switch?????

Bart

**Joe_Black** · 05/09/2006, 01:10 PM

LOL! Welcome to Isuzu ownership! That heavy-truck driveline is known to make a lot of "clunking" noises as the torque converter and u-joints load up and unload. Don't worry, either you'll get used to it or never drive an Isuzu truck again.

**nfpgasmask** · 05/09/2006, 01:31 PM

Originally Posted by Joe_Black

LOL! Welcome to Isuzu ownership! That heavy-truck driveline is known to make a lot of "clunking" noises as the torque converter and u-joints load up and unload. Don't worry, either you'll get used to it or never drive an Isuzu truck again.

Well, I don't think this was normal "clunking". Especially since it stopped after I parked for 30 minutes. From everything I have read on here, it seems like it is this infamous "mode selector".

Is this part easy to swap out? It sounds like I can get it from Merlin in MO pretty easily, but my next question is if I should attempt to do this myself, or if I should take it in. I am on the hunt for a qualified, good, honest Isuzu mechanic in the Chicagoland area.

Bart

**AlaskaVX** · 05/09/2006, 01:47 PM

Now since it only has 25,000 miles on it I doubt this is it but if the previous owner installed Tone's interceptor (intercepts transmission electronics) they could have the line pressure set high and that would cause a pretty good clunk, but mainly during downshifts.

However I get a lot of clunks with mine as well, and it could possibly be normal...... maybe make sure your drivelines are solid as well, grease the zerks. Keep your eye on the dash lights to see if the light jumps around from "2nd" to "D" to "3rd" etc. this seems to be the real tell tale sign that your mode selector is out of whack.

**Ruflyf** · 05/09/2006, 02:41 PM

First, check or have someone check the fluid lvl, making sure it looks right as well as being full. Then, I would try driving it with the "power" light opposite of how it was when the clunking happens to see if it still happens. Do you think the problem may be temperature related?

**nfpgasmask** · 05/09/2006, 04:37 PM

Originally Posted by Ruflyf

First, check or have someone check the fluid lvl, making sure it looks right as well as being full. Then, I would try driving it with the "power" light opposite of how it was when the clunking happens to see if it still happens. Do you think the problem may be temperature related?

Personally, I do not think the temp could have been the cause. The weather here has been mild, only around 65-70 degrees, and I was not driving long when this started happening....but what do I know! I will check the fluid levels this weekend when I do the rest of the stuff. And, just to let you know, I drove all the way home (13 miles) with no clunking and then later went and picked up my wife from work, and again, no problems...so go figure.

Thx, Bart

**Ruflyf** · 05/09/2006, 04:41 PM

Ok, but I was talking about the engine or transmission temp.

**nfpgasmask** · 05/09/2006, 04:56 PM

Originally Posted by Ruflyf

Ok, but I was talking about the engine or transmission temp.

Yeah, I'm not sure, no lights came on. Anyway I can tell?

Bart

**Ruflyf** · 05/09/2006, 05:00 PM

I would think if they light up during the pre-ignition start then the bulbs should be good.

**skunkworks** · 05/09/2006, 05:07 PM

Could be the neutral safety/gear selector switch going bad, a common problem. If it does it again shift through the gears and see if it stops doing it. Switch is $120 to 150 depending on what kind of deal you can get at the dealer.

albert
________
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**nfpgasmask** · 05/09/2006, 05:21 PM

Originally Posted by skunkworks

Could be the neutral safety/gear selector switch going bad, a common problem. If it does it again shift through the gears and see if it stops doing it. Switch is $120 to 150 depending on what kind of deal you can get at the dealer.

albert

Is this the same as the "mode selector" everyone is talking about?

Bart

**psychos2** · 05/09/2006, 05:33 PM

The first thing to check is trans fluid level !!! It solved the problem for me. After the isuzu dealer did not add enough fluid back to the trans after changing the gaskets on the drain plugs. shawn

**nfpgasmask** · 05/09/2006, 08:20 PM

Will do! THX! Bart

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