Why does my truck die when I put the clutch in?

Tiny
ISUZU8595
  • MEMBER
  • 1985 ISUZU TRUCK
  • 120,500 MILES
Ill be driveing need to shift and if I dont do it really fast it dies on me and ive checked the vacuum hoses and there all good and the idle is turned up and I dont know whats wrong!
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Friday, December 30th, 2011 AT 10:36 PM

35 Replies

Tiny
RASMATAZ
  • MEMBER
What liter engine?
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Friday, December 30th, 2011 AT 10:46 PM
Tiny
RIVERMIKERAT
  • MEMBER
Check for vacuum leaks and low fuel pressure.
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Friday, December 30th, 2011 AT 10:53 PM
Tiny
RASMATAZ
  • MEMBER
Did you get PM?
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Friday, December 30th, 2011 AT 10:56 PM
Tiny
RIVERMIKERAT
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Yes.
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Friday, December 30th, 2011 AT 11:21 PM
Tiny
ISUZU8595
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Its a 1.9 liter and I already checked the vacuum hoses, Whats "P" and how do u check the fuel pressure?
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Saturday, December 31st, 2011 AT 12:11 AM
Tiny
RIVERMIKERAT
  • MEMBER
With a fuel pressure gauge that you rent or borrow from a parts store. Hoses aren't the only sources of vacuum leaks. Intake manifold gaskets. Cracked intake manifold. Carburetor or throttle body gaskets. Cracked throttle body. Leaking seal on brake booster. Etc.
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Saturday, December 31st, 2011 AT 12:30 AM
Tiny
ISUZU8595
  • MEMBER
All the gaskets r good I replaced those
what is the most likely possibility
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Saturday, December 31st, 2011 AT 2:16 AM
Tiny
RIVERMIKERAT
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Does it idle without using the throttle? Spray carb cleaner anywhere a vacuum leak is likely. Unbolt the brake master cylinder from the booster and see if you hear a hissing sound.
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-1
Saturday, December 31st, 2011 AT 3:10 AM
Tiny
ISUZU8595
  • MEMBER
When u first start it yes it can just idle but after you start to go and then u have to start stoping it like I dont know. Like on my way home I go bout 50 mph and when I have to turn onto my road I put the clutch in and then wait like 5-10 seconds and it dies also I just put a rebuild on the carb could it be that it dosnt have enough gas going through it completly yet?
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Saturday, December 31st, 2011 AT 3:41 AM
Tiny
RIVERMIKERAT
  • MEMBER
Ahah! I'm guessing the carburetor is incorrectly adjusted. Either the bowl float isn't adjusted right, the idle mixture is way off, or the idle jets are clogged.
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Saturday, December 31st, 2011 AT 4:01 AM
Tiny
ISUZU8595
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Oh also I have it straight piped so could no back pressure be an issue
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Tuesday, January 3rd, 2012 AT 3:03 AM
Tiny
RIVERMIKERAT
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See my last post.
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Tuesday, January 3rd, 2012 AT 3:47 AM
Tiny
ISUZU8595
  • MEMBER
Yeah I know I looked at all that already and its fine
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Tuesday, January 3rd, 2012 AT 3:51 AM
Tiny
RIVERMIKERAT
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Pull the plugs and take a look at them. What color are they? YOu adjusted the needle valve(s) on the throttle plate? I don't mean the idle speed adjustment on the throttle linkage.
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Tuesday, January 3rd, 2012 AT 3:58 AM
Tiny
ISUZU8595
  • MEMBER
The plugs are good and no I dont know how to adjust those im 16 and this is my first truck you get me back and fourth and so I can work on it so im just learning alot of new stuff
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Tuesday, January 3rd, 2012 AT 4:03 AM
Tiny
RIVERMIKERAT
  • MEMBER
What do you mean by 'the plugs are good'? How old are they? What color are they?

On the very bottom of the carburetor, probably on the front, but maybe one of the sides, you'll see a small screw. That is the idle mixture screw. It adjusts the amount of fuel that is allowed into the throat of the carburetor at idle. Close it until the engine starts acting badly. Then back it off one quarter turn. You want to turn the idle speed down some before doing this step.

OK. HOLD THE PHONE! Look at the attached image. It'll help you locate the idle mixture screw and may explain why you can't locate it right not. It's covered by a plug.
TUNE-UP - 4-CYL -1985 Isuzu Pickup
Page 1 of 1
IDLE MIXTURE

NOTE:
Mixture adjustment is NOT a part of a normal tune-up procedure and should not be performed unless carburetor is overhauled, fuel injection
system components are replaced, or vehicle fails emissions testing.
1.
Set parking brake and block drive wheels. Place transmission in Neutral. Remove carburetor from vehicle.
On all other models, drill a hole in seal plug and remove. Remove shavings with compressed air. Install carburetor.
On all models, disconnect and plug distributor vacuum hose, canister purge line and EGR vacuum line. Disable idle compensator vacuum line by pinching rubber hose. With engine at normal
operating temperature, choke open and A/C off (if equipped), adjust idle speed.
Connect positive lead of dwell meter or duty meter to duty monitor. Ground negative terminal. Turn idle mixture screw in all the way. Back out 1 1/2 turns.
2.
3.
4.
Fig. 3: Removing Mixture Screw Plug
5.
Adjust throttle adjusting screw to specified RPM. See IDLE SPEED SPECIFICATION table in this article. Check meter and ensure that dwell is varying. Adjust setting of idle mixture screw to obtain
an average dwell or duty as specified.
Reset throttle adjusting screw. Put idle mixture screw plug back in place. If equipped with A/C, follow steps 3) and 4) of IDLE SPEED ADJUSTMENT.
6.
DWELL OR DUTY METER SETTING Application
Dwell Meter Duty Meter
Setting 36
40%
Federal

1.
Set parking brake and block drive wheels. Place transmission in Neutral. Remove carburetor from vehicle. Drill a hole in plug and remove. Remove shavings with compressed air. Install carburetor.
Disconnect and plug distributor vacuum hose, canister purge line and EGR vacuum line. Disable idle compensator vacuum line by bending rubber hose. With engine at normal operating temperature, choke open and A/C off (if equipped).
Adjust idle speed screw to 750-850 RPM on man. Trans. Or 850-950 RPM on auto. Trans. Turn idle mixture screw in all the way and back out 3 turns. Adjust throttle screw to 800 RPM on man. Trans.
And 900 RPM on auto. Trans.
Adjust idle mixture screw to achieve maximum speed. Reset idle speed screw to 850 RPM on man. Trans. And 950 RPM on auto. Trans.
Turn idle mixture screw clockwise (lean) until engine speed is down to 750-850 RPM on man. Trans. And 850-950 RPM on auto. Trans. Replace idle mixture screw plug. If equipped with A/C, follow
steps 3) and 4) of IDLE SPEED ADJUSTMENT.
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Tuesday, January 3rd, 2012 AT 5:01 AM
Tiny
ISUZU8595
  • MEMBER
The plugs are not even a year old and they are a goldish color. And thanks I know exactly where that is also what if I dont have a tachometer
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Tuesday, January 3rd, 2012 AT 5:24 AM
Tiny
ISUZU8595
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Also you have two number "1" and one says back out 1 1 2 turns and the other back out three turns so im confused now
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Tuesday, January 3rd, 2012 AT 5:41 AM
Tiny
RIVERMIKERAT
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The book isn't very clear, but I believe the first section is for California-equipped vehicles and the second is for non-CA cars. You should be able to borrow a dwell meter, tachometer, or timing light with tach from somewhere like O'Reilly's, Autozone, Advanced, etc. I just set it by ear, personally.
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Tuesday, January 3rd, 2012 AT 6:13 AM
Tiny
ISUZU8595
  • MEMBER
Ok so I went outside and there wasn't a plug but I screwed it all the way in and it took 4 turns to go all the way in and then I pulled it out 3 so it should be fixed now right?
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Tuesday, January 3rd, 2012 AT 6:17 AM

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