when ever i shut my motor off my car goes "ca clunk ca clunk ca clunk etc etc" why does this happen? i messed with the timin n i tryed everything, i dont know if its my idle or what, when i shut it off sometimes it shuts of at 1,500 rpm n makes the noise, sometimes at 1,200 rpm, my idle is 600 rpm. im puzzeld by this..if any 1 knows bout this i apreciate for yur help

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80 series flowmaster,8.8, 2.5 in exuast plug wires, accel super coil,accel distriburator, 650 holly n a polished elderbrock rpm performer comin soon

 

It's called dieseling, the most likely cause is a vaccum leak, mine leak was a shot carb.

Check all your vaccum lines.

 

Sounds like the timming.



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92 RS, 350, Street & Performance MPFI, TFS heads,
Crane Rollers,
MSD Digital 6 Plus, 22lb injectors,
ZZ3 cam, Edelbrock Headers 1 5/8, 3" Exhaust,
Hi Flow 3" Cat, stock T-5,
stock rear 3.08, koni yellow adjustable front, twin turbo glass hood, T-tops, Auto Meter Ultra Lite Series 2 5/8 gauges, Teal Green

 

vacume lines are good,my timin on the other hand i dont know on what to set it on.i tryed al kinds of settings, 1 was when i had no pic up so i advanced it and have lots of pic up. now im puzzeld

 

Could be that little anti-run-on solenoid in the carb. The one in my old carb was fuct.

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DR Stevens
1984 Trans Am 305HO L69
sucks gas, hauls ***
1991 Firebird 305 LO3
for days when I need a/c

 

Sounds like timing to me. But I maybe wrong.

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'87 Trans Am:
(Engine)
305 TPI
180 Degree Thermostat
JET Fan Switch
TB Bypass
Accel 300+ 8.8 Racing Wires
Accel Super Coil
Bosch Platinium Plugs
Custom Ram Air with K&N
Removed Emissions Equipment & Cat.
(Stereo)
Full Kenwood Excelon System

 

Dieseling...just got rid of that problem. Timing can be the cause, in my case it was too high an idle. Once I turned that down, I didn't have a problem. How's the engine temp? A cooler thermostat may help if you're overheating. Hope this helps...

 

the temp is always at 160-180

 

Another excellent cause of dieseling or "run-on" is carbon deposits or other "hot spots" in the combustion chamber.

Another thing not to do is to shut the motor off at high idle, especially if the motor is prone to dieseling already. Place it in D before turning the key off or load the engine down with the clutch.

It's also not very good for the motor.

 

Probally to far advanced timing. Mine did this when the timing was advanced too much. Any pinging?

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lg4
slp muffler
pro flow air cleaner
performer intake
cat delete
ratchet shifter
160* stat
q-jet from 1970 vette
NITRO JUNKIE TAP DANCIN' ON A LAND MINE

 

Choke, choke, choke. If you try to shut your car off at any more than 1000 rpms it will diesel. Clean the carb off, focus on the choke and replace the choke pull-off.

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1985 Z28, Jasper Class 1 350, Edelbrock Performer intake, Dual snorkel air cleaner, K&N, Edelbrock headers, Catco 3" cat, Hooker 3" cat-back, Richmond 3.73's, Transgo shift kit, JET Stage 2 chip, Hypertech coil, Lakewood LCA's, Powertrax locker, SSM subframes, Centerline Auto Drag's

 

im gona clean the carb out 2moro with gumout spray or what ever else i find, but i dont get somethin, my 89 iroc never done this n my 79 camaro never done it ethier, even my 94 toy truck never did somethin like this, i would use to rev the motor before i shut it off, now with this thing i have to have it at 700 or lower rpm to shut it of.

 

Why do you rev the motor to shut it off?

 

its a habit, show of my exuast,