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Post by nikolaiv on Aug 21, 2005 20:15:48 GMT 11
My Bighorn (1994 Irmscher 31.TDi w/ 4JG2)has just started making a horrid whining noise as revs build.. I initially though it was the turbo, but the noise sometimes goes away if I leave the throttle buried, and i though that if the turbo was crying for help, revving it harder wouldnt make it quiter....
The symptoms:
- as revs rise, a shreiking/whining noise starts, which either stays for a while or peters out as revs rise
- no noticeable power decrease
- noise coming from the RHS of teh firewall (by brake booster)
Now i dont` think it`s the turbo, as it gets serviced every 5k, I have aturbo timer and it had a Brand new turboi fitted 52k ago.
Any Ideas, cant afford for it to go to the shop for a while so any advice would be great.
Thanks, Nick
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Post by geeves on Aug 21, 2005 21:21:06 GMT 11
I had a similar noise in my 2.8 soon after buying it that took a while to find. It was a leak at one of the intercooler joins. What made it had to find was that it wouldnt do it when you free rev the engine only under load.
Yours sounds similar but could still be a turbo problem. Does it do it on no engine load or going downhill? Does it change with throttle position?
It might be worth getting a mechanics opinion even if it doesnt get fixed straight away just in case its more serious
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Post by mudgrip4 on Aug 22, 2005 14:19:01 GMT 11
Other option if horrible whining shreiking noise occurs as you build revs is to lean over, open passenger door and kick wife out, then retest. Could be fine.  |
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Post by Andrew on Sept 27, 2005 8:28:48 GMT 11
 I had the same noise.... revs went up, it stopped, lasted for 5 months then ... well never mind what happened next.. lets just say 1 x new turbo later... When the old unit came off the main bearing was dead and the waste gate was frozen solid... Ouch.. New one goes well... 
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Post by Roger on Oct 4, 2005 18:53:52 GMT 11
If you blow the turbo, the turbo's making the noise. If you don't blow the turbo- the turbo's making the noise. My turbo made no noise when I bought th MU and now it does, even with t/timer from the start and warm up every morning. My mate redid his turbo not long ago and it now makes noise too I enquired for mine and decided that I'd do something when it goes to hell.  |
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Post by caffa on Oct 7, 2005 13:28:49 GMT 11
Other option if horrible whining shreiking noise occurs as you build revs is to lean over, open passenger door and kick wife out, then retest. Could be fine. ROFL. That was my first thought when I read the subject as well ... But really, they're not bad all the time. I wouldn't swap mine for the world ..... unless somebody has an intercooler for a 4jg2 ;D |
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Post by sneeble on Oct 12, 2005 19:23:54 GMT 11
my turbo started making some dodgy noise on the way home, we made it back ok and I cant for the life of me get it to do it again. I suspect its the waste gate and I think I will call it a day and look at replacing it. A real pity the old girl has served me well, its gone some pretty extreme places and put up with extreme conditions. We will most likely replace it with another isuzu, for many reasons the main ones being my partner is 6 foot 4 and its the only vehicle he has ever been able to sit in comfortably, and my occupation is fishing. I write for a fishing mag and I need a good reliable 4x4 which good has fuel economy to get me around the country and put up with the abuse I put them through.
I have had a number of trucks and 4x4's over the years, including an old landrover with prerequisite crowbar for reseating the shocks.
I just hope the turbo doesnt give out before I plead to the bank manager for money. Pity really, we just topped up the mortgage for 20k to consolidate, fix the old girl and get the materials needed to renovate. Not much change was leftover.
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Post by geeves on Oct 13, 2005 8:26:28 GMT 11
High top lotus is quite a rare beast Hope you get good money for it. Noisy might not of been the turbo what did it sound like?
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Post by sneeble on Oct 14, 2005 10:26:28 GMT 11
I am unsure, but it only happens under load and reduces when up to speed.
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Post by geeves on Oct 14, 2005 11:58:13 GMT 11
Sounds like a leak between the turbo and inlet manifold. It took weeks to take a similar noise down on mine as it wouldnt do it with the bonnet up.In the end it was bad sealing between the inlet manifold and the plate that had been made up to replace the emmision control valves.Nothing a little sealant wouldnt fix in 5 minuites. If it is the turbo I might be able to put you onto a cheap one.
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Post by sneeble on Oct 14, 2005 12:44:40 GMT 11
I will be going into town tomorrow if you want to catch up, other half has to fly to Auckland Sunday night so we are coming in for the bits and pieces he needs from work.
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Post by geeves on Oct 14, 2005 16:07:23 GMT 11
Give me a ring first At this stage I dont know what Im doing tomorrow 9366074. Are you still interested in the rear door? The turbo I know of hasnt been tested yet but I can make a phone call and get an answer if your interested. The car its on has 307000 on it and the previous owner was told the turbo was blown but we think its the exhaust manifold not the turbo. If its no good I have been told of anouther being wrecked in Foxton but dont currently have details
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Post by sneeble on Oct 14, 2005 16:21:43 GMT 11
still interested in the door but need an opinion on the turbo, given the age I think it may not be worth spending much more on it. Although suprisingly the replacement value for insurance actually increased.
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Post by geeves on Oct 15, 2005 5:10:54 GMT 11
sorry wrong number in last post try 9386074 Had yesterday on industrial action so not thinking straight. Got lots of things done tho
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Post by sneeble on Oct 25, 2005 16:33:01 GMT 11
it gets to be an even bigger mystery, the whine has gone but it now sounds like there is a hole in the exhaust, only it coming from underneath the manifold.
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Post by geeves on Oct 26, 2005 13:45:33 GMT 11
You can see this area fairly well by removeing the rubber panel on the inner gaurd so should be able to see a leak with a very good torch while engines cold
good luck
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Post by sneeble on Oct 31, 2005 17:41:32 GMT 11
I am very pleased to announce thats the potentially destructive noise and subsequent smoke and noise is a blown gasket between the manifold and exhaust.
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Post by geeves on Oct 31, 2005 18:06:26 GMT 11
Most things that kill Isuzus dont make much noise so thats good and at least the parts will be cheap. I know of anouther bighorn that was put off the road for a year then sold and wrecked for the same problem. Mechanic told the owner the turbo was blown. 1 new gasket and the engines a good runner
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I had the same noise.... revs went up, it stopped, lasted for 5 months then ... well never mind what happened next.. lets just say 1 x new turbo later...
