North American Turbocoupe Organization



whats that damn noise
chrome302jr Offline
Junior Member
#1
Hey guys, bear with me on this one as I try to explain the prob Im having. Recently when Im in my TC and go to give it gas, the turbo kicks in and at around 5psi or so, there is a clicking noise coming from the engine. Sometimes the boost will go all the way up, but sometimes the clicking gets worse with increased boost. Im not sure if the clicking noise is coming from the turbo or what, its hard to tell.All I know is that the car will make a clicking noise and stutter. Sometimes its so bad that when the turbo kicks in at all, the car will stutter pretty bad. Hope Ive been descriptive enough. Thanks for any opinions.

Ronnie

1988 Tbird 5.0 HO 14.7 @ 93mph 1/4 N/A
No nitrous times yet..
1988 TC
88 Tbird 5.0 [email protected]
88 Tbird TC slow....
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86tc Offline
Member
#2
Not positive, but maybe it could be a bent valve???

Rick
'62 Ranchero (in progress...again)
'72 Gran Torino Sport (for sale/trade)
'76 Honda CB750 (for sale/trade)
'88 Yamaha Blaster Race 4-wheeler (for sale/trade)
'89 Lincoln Town Car (for sale/trade)
'92 GMC Safari Conv. Van (for sale)
'94 Pontiac Bonneville
'96 GMC Jimmy
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SteveX82 Offline
Posting Freak
#3
It is a rhythmic ticking noise (ie, the ticks are evenly spaced and become more rapid as rpm's increase)? Or is it more of a random ticking noise like "marbles in a soda can"? And does it only happen under boost? Ticking noises can happen for tons of reasons, ranging from relatively benign injector noises to really really bad detonation. Let us know exactly what the clicking sounds like and when it occurs, and we'll try to help you diagnose the problem.

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maroon 1987 TC 5spd, 128k miles

k&n cone in fenderwell, gillis valve set at 17lbs, kirban adjustable fpr set at 40psi, walbro 255 hi-pressure pump, bosch hi-pressure bypass valve, ported e6

Best 1/4 mile: 14.778 (with 2.198 60' time)
Best trap speed: 94.01mph
Estoril blue 1987 TC 5spd, 148k mi, a237, Bailey BOV, spec stg3 clutch, spearco FMIC, 50 trim t3/t4, 3" exhaust, Bamafuel, LM1, 55pph
Best 1/4 mile: 12.31 @ 110mph on 25psi
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chrome302jr Offline
Junior Member
#4
Thx for the reply. It only happens under boost, and usually either gets worse as boost increases or goes away completely. It is not a rhythmic click, but I can always predict when its gonna happen. Its hard to describe the noise, but it really doesnt sound like its an engine noise, more from the from right of the motor. Its also random ticks. Its not detonating, the knock sensor isnt coming on(its come on before, so I know it works). Thx again

Ronnie

1988 Tbird 5.0 HO 14.7 @ 93 mph 1/4 NA
no nitrous times yet...
1988 TC
88 Tbird 5.0 [email protected]
88 Tbird TC slow....
Reply

Pete D Offline
Administrator
#5
take the VAM hose off at the compressor inlet and take the inlet off the compressor. Using something soft, like fingers try to move the shaft back and forth and side to side. Turn the blades a little as your doing this. Is anything rubbing. Almost any perceptible movement means wear in the bearings. If the blades are hitting anything at all, don't drive it. If the blades are not hitting, are any broken off or chipped, causing an imbalance. If the blades break and pass through the engine it's goodby engine.

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NATO Member
88 TC X 2, 86 SVO, Main TC with K&N, 3"DP to 2.5"duals through Dynamax, Ric valve at 17+ and disconnected KS. Elite Bodega 16" chrome wheels. Autometer pod w/ A/F and Vac/boost gauges.140 mph Motorsports Speedo New engine: Total Seal rings and TRW pistons, ported and polished head w/ cc'd chambers,1.59"exhausts, SS valves, gutted upper, knife edged lower, A-230 cam, Race Engineering Adj Cam Sprocket, Crowlers, ARP head studs, and rod bolts. Walbro 255 HP pump and Kirban adj FPR, T-3. Centerforce II, KB subs and jack rails.

[This message has been edited by Pete D (edited 03-06-2002).]
Pete Dunham


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Rodger Offline
Member
#6
I had a noise similar to your description but I could not feel it as in "the car having a stutter". The noise I had sounded like it was coming from the right inner fender area. I decided it didn't sound like an engine noise. When I installed a Gillis valve and stopped using the BCS, the noise immediatly stopped and hasn't repeated since. Thats about 2 months ago. So possibly the BCS was making the noise when the turbo generated boost.
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TurboCougar Offline
Banned
#7
Possibly an exaust pressure leak at the manifold to head,manifold to turbo or turbo to downpipe. They can make ticking sounds especially under boost.
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BJL Offline
Moderator
#8
Sounds liek what i fised tonight, the car woudl star tincreasin bosot you hear liek a peacie of papaeer flapping int eh wind, and the car woudl sputter, my intercooler hosue are full of oil and saoked so they are fleibel and leakin soem pressure out and when it does this the very thin rubber hosie im use ifs flapping, took soem 5min epoxy and seals it up good, i woudl nto recomend using epoxy to sela it but the reason i do it cuZ the engien has so much oil in the intake form all the engine blow by no reason to buy new hoses and destroy them.

Check all the hoses to the Intercooler and turbo and the throttel body.
Also when you are liek cruisin in 4th or 5th, just floor it, does the tickin there? or does it onlt tick when the car shows boost, if you have the pedal floorewd and the car is not acclerating cuz of the low rpm that is an exhuast leak.
If it makes hte niose whiel boost it in ont he intake part of the engine

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Brian J Larkin
1988 Turbo Coupe 5spd, dark blue and shining like a peice of polished glass.
http://crazydriver358.5u.com
Brian J Larkin
88TC 328,000 miles
T3, FMIC ,3in stinger exhaust, PimpXS ECC,gillis,
255 walbro, afpr, 5spd swap,spec clutch, sn95 5 lug, Cobra 13in front brake. Vacuum assist brake conversion. 
89 Cougar XR7 3.8SC Auto
95 Ranger Splash 3.0 auto
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chrome302jr Offline
Junior Member
#9
Well I just finished replacing the rear rotors and brake pads, which was a pain in the ass by the way. So now Ive got some time to spend finding the noise. Im beginning to think the noise is coming from somewhere else now. I also hear the noise right after I shift, as soon as I release the clutch and also from a stop. So the noise doesnt only happen under boost. The car will only shutter when Im trying to accelerate hard, not under normal driving conditions. The noise will get worse with increased boost though. Im lost. Any ideas? Thx guys

Ronnie

1988 Tbird 5.0 HO 14.7 @ 93 mph 1/4
Nitrous times soon..
1988 TC
88 Tbird 5.0 [email protected]
88 Tbird TC slow....
Reply





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