1994 Chevy S-10 black smoke

Tiny
JUSTINW
  • MEMBER
  • 1994 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 254,000 MILES
I have a 1994 s10 2.2 it is hard to start and when it starts it puffs alot of black smoke then it will run fine then when I go to take off it puffs more black smoke then it runs good it only does this when I shift to a gear then give it gas after that it is fine but it does it everytime is step on the gas. The motor was replaced it only has 6000 miles on but the fuel preasure regulator was not. I took the vacum like on the fuel preasure regulator and it smellt like fuel like I said it only does this when it start it and give it the first bit of gas but it is good after that
Friday, April 18th, 2008 AT 12:43 PM

13 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
There should be no fuel in that vacuum line check out our video on how to test feul pressure...is the service engin soon light on?
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
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Friday, April 18th, 2008 AT 12:46 PM
Tiny
JUSTINW
  • MEMBER
  • 9 POSTS
Yes the light is on it seems like it dumps alot of fuel when you hit the gas the vacum line smeels like gas. If the truck sits for a long time it wont do it right away but it always does it
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Friday, April 18th, 2008 AT 2:33 PM
Tiny
MERLIN2021
  • MECHANIC
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https://www.2carpros.com/forum/automotive_pictures/62217_GM_DLC95_Older_8.jpg


Cross these two terminals as shown, then turn the key on. Count the flashes, a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 12. Write them down and post here. This connector is right under the middle of the dash...
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Friday, April 18th, 2008 AT 8:18 PM
Tiny
JUSTINW
  • MEMBER
  • 9 POSTS
Who ever had this truck must of cut it out the only plug I can find is under the hood but it is a ten pin sorry what eles can I do I have just chagned the fuel preasure regulator it it still does it my plugs are black and the oil is black can the oil be to full I have high oil pressure it only does this when I start it or when I tap on the pedal to shift iin between it is ok I am lost
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Friday, April 18th, 2008 AT 9:39 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
I recommend you change the oil and filter, if the plugs are black change them, change the engine coolant temp sensor, it's on the thermostat housing, change it when the engine is cold. Then check your spark, is it strong bright blue? or weak and yellow?
Your data link connector is on the left side of the dash to the right of the steering column...
https://www.2carpros.com/car_repair_video/test_engine_ignition_system.htm
Check this video on spark testing...be carefull high voltage can injure you...
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Saturday, April 19th, 2008 AT 7:01 AM
Tiny
JUSTINW
  • MEMBER
  • 9 POSTS
The spark is blue and the data link is not there someone must of cut it out when they put the alarm in it I took out the alarm. I started it this morning it was fine then I shut it off waited and started it again and then it started doing it againblack smoke when I hit the gas and if I hold it it goes away
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Saturday, April 19th, 2008 AT 12:02 PM
Tiny
MERLIN2021
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We need to find out where that DLC went! See if they un screwed it and tucked it up someplace. See if you can find a white/black and orange wire together.
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Saturday, April 19th, 2008 AT 1:08 PM
Tiny
JUSTINW
  • MEMBER
  • 9 POSTS
There is no wire like that under the dash I pulled the hole dash out the only plug that would look likr that is under the hood but it is a pin it say (p.E.D.4) on the cover and the pins are lettered a through k I tried the a ans b pins but no codes do you think it could be the cam postion sensor there it a plug that goes from lower passehger side block to the coil packs
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Saturday, April 19th, 2008 AT 2:43 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Did you check that ECT yet? Use an ohm meter probe across the sensor cold, then as it warms up the final reading should be about 177 ohms, the cold reading should be about 100,000 ohms.
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Saturday, April 19th, 2008 AT 6:28 PM
Tiny
JUSTINW
  • MEMBER
  • 9 POSTS
The problem was the temp sensor thankyou so much you really know your stuff. But hey there grasshopper new quiz for you I have a 1988 lincoln mark 7 it will not shift to overdrive what could it be at 65 or 70 I am at 3000 rpms could it be a vacum or a speed sensor but thankyou again for all the help when I get a little more money I am going to for sure donate alot because of you
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Tuesday, April 29th, 2008 AT 12:16 AM
Tiny
MERLIN2021
  • MECHANIC
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What's the mileage on the lincoln?
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Tuesday, April 29th, 2008 AT 2:24 AM
Tiny
JUSTINW
  • MEMBER
  • 9 POSTS
It only has 102,500 miles on it, what it is doing is it wont shift into over drive the only way that I can even shift it is to floor it for a minute then let off and in second and third it seems to rev a little high then slowly catch the gear. The fluid is brown and I here a hissing noise coming from the shifter so I took off the cover and there are vacum lines going to the shifter. Could it be a overdrive relay some kind of vacum module a selinoid or what I am lost once again
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Tuesday, April 29th, 2008 AT 8:05 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
If the fluid is brown, thats the first thing on the list! The screen may be clogged. The TV cable may need adjustment as well, a tranny shop can adjust that in about 30 seconds! The vacuum is for the parking brake release.
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Wednesday, April 30th, 2008 AT 2:26 AM

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