Helping a Brother in Need...

Just got off the phone with my brother to see if he can come over to help me try and figure this thing out before all my hair is gone. As it turns out he's got some problems of his own I didn't know about.

He's got an '88 chevy running a stock 305 throttle body. the engine always ran perfect until he let it sit for 2-3 months this past summer. After starting the engine for 5 minutes it starts to run rough with lots of black soot coming from the exhaust. Total loss of power. He stated that it seems to be loading up on fuel. He figured that it needed a tune-up because it had been some time since the last one. He changed the plugs, air filter, cap and rotor. None of these things have made any difference.

Again, the engine always ran well until it sat for 2-3 months. The motor is a totally stock chevy 305. electronic ignition and throttle body injection. Starting is no problem, 5 minutes later severe black soot from exhaust and loss of power.

Thanks for all the help.

Bart

I'm not sure.....but could the cadylic converter be plugged. Just an idea:HMMM:

Maybe a bad sensor that's giving the wrong signal once it warms up?????:confused:

What about old gas? Did the truck get driven just once in a while before it sat to where he didn't have to fill it up all the time and maybe it's old? Clean the fuel injectors? Sensor? That's all that I can think of....

you need to check and see if you have any codes in your computor. you can do this by jumping the A and B wires in the DLC. the dlc is located under the dash on the drivers side. give me the codes and i can tell you what it is.


Locate Data Link Connector (DLC), see image below.
Jump the A&B terminals(a paper clip or a jumper wire work ok)
Turn Ignition switch to ON position.
Count the flashes on the "CHECK ENGINE" or "SERVICE ENGINE" light.
FLASH, pause, FLASH, FLASH = code 12
NOTE: Some 94 & 95 models do not have the B terminal. In which case a scanner is required.

All vehicles after 96 are OBDII,and require a scanner to access hink of.... [/B][/QUOTE] :confused:

dont make fun of my drawing eather:D

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Originally posted by lt1s10

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:confused:

dont make fun of my drawing eather:D [/B][/QUOTE]

:LOL: :LOL: :LOL: :LOL: :LOL:



Just Kiddin':)

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Originally posted by pro70z28
:confused:

dont make fun of my drawing eather:D

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Just Kiddin':) [/B][/QUOTE]

i guess it was right funny. :LOL: :LOL: :LOL: :LOL:

have you checked the o2 sensor? Chevy is notorious for the o2 sensor goin bad after it sets for a while

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Originally posted by pro70z28
Maybe a bad sensor that's giving the wrong signal once it warms up?????:confused:

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I would echo that response. He He He:LOL: :LOL: :LOL: **)

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Originally posted by pro70z28
I would echo that response. He He He:LOL: :LOL: :LOL: **)

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if the 02 senor was bad then it should set a code. :rolleyes: :LOL: :LOL:

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Originally posted by lt1s10
if the 02 senor was bad then it should set a code. :rolleyes: :LOL: :LOL:

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HEY lt1s10. You wouldn't have a drawing of what to look for wood' ya' ????? He He HE**) :LOL: :LOL: **)


Sorry, I'm be - in' bad. Monday night football iz' a snoozer tonight. :LOL: :whacked:

:mad: i dont do drawings on mo. :LOL: :LOL: :LOL:

:mad: i dont do drawings no mo!!! :LOL: :LOL: :LOL:

Thanks for the help. I jumped the terminals and get 2 different sequences of flashes. first seems to be flash(pause)flash flash. three times. Then flash(pause)flash flash flash flash flash. 3 times also.

What do you think?

Bart

lt1s10,

Oh, bye the way. The drawing was almost an exact match to what I found under the drivers side dash. Keep up the good work!

Thanks again...

Bart

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Originally posted by BARTS31
lt1s10,

Oh, bye the way. The drawing was almost an exact match to what I found under the drivers side dash. Keep up the good work!

Thanks again...

Bart

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im glade you said"almost". looks like youve got a bad temp sensor. the codes 14 and 15 says its the temp sensor. you have a temp sensor for the computor and you have a temp sending unite for the gauges. the dif is the one you need to replace has 2 wires going to it and the other just one wire. should be on top of motor screwed into the intake. the other should be in the left head. thats the same thing as the choke on a carb. motor.thats what i thought it should be but now you know. :LOL: :LOL:

Hey Lt, thought it was a great drawing !!! Of course that compliment comes from a guy who can't even draw stick people !!! I did have to take art class in high school once. guess I should of paid more attention instead of spending all my time hittin' on the cute little blonde girl that sat next to me !!!!!

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Originally posted by Dave Severson
Hey Lt, thought it was a great drawing !!! Of course that compliment comes from a guy who can't even draw stick people !!! I did have to take art class in high school once. guess I should of paid more attention instead of spending all my time hittin' on the cute little blonde girl that sat next to me !!!!!

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i almost failed mech. drawing in h. s. because my printing was so bad and there wasnt any cute blondes around eather. i love to do this but it makes it hard when you cant type, spell or draw, now i know why i ended up being a grease monkey all my life, i couldnt do anything else. :LOL: :LOL:

Problem fixed ! Thank you lt1s10. My brother picked up the new sensor for $20.00, installed it and the engine runs perfect now. Just want to know if there is a way to clear the codes from the system.

Thanks again.

Bart

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Originally posted by BARTS31
Problem fixed ! Thank you lt1s10. My brother picked up the new sensor for $20.00, installed it and the engine runs perfect now. Just want to know if there is a way to clear the codes from the system.

Thanks again.

Bart

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yes, remove the bat cable from the bat . for a few mim. glade to help:D