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Tims Auto Repair
Tims Auto Repair, GMC Mechanic
Category: GMC
Satisfied Customers: 16036
Experience:  have owned a repair shop for 25 years
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I have a 92 suburban with a 454 with a throttle body and the

Customer Question

I have a 92 suburban with a 454 with a throttle body and the other week the teflon timing chain let go and stripped tops off coggs chain had been changed and been put back together now throttle body is shooting a massive amount of gas out so what would be the cause of that
Submitted: 11 months ago.
Category: GMC
Expert:  Tims Auto Repair replied 11 months ago.

Hi, My name is ***** ***** for the delay.
I will do my best to assist you.

Expert:  Tims Auto Repair replied 11 months ago.

will it start at all now?

Customer: replied 11 months ago.
No
Expert:  Tims Auto Repair replied 11 months ago.

ok..has it ever started sense you replace the timing chain?

Customer: replied 11 months ago.
Noit hasnt
Expert:  Tims Auto Repair replied 11 months ago.

are you sure it is in time?

Expert:  Tims Auto Repair replied 11 months ago.

it is possible to got the chain out with the distributor when you installed the chain

Customer: replied 11 months ago.
Chain is right but someone else put distributed in while I was working on other things so I gotta check it this morn
Expert:  Tims Auto Repair replied 11 months ago.

ok

1-remove the #1 plug.hold your finger on the plug hole,have your help to bump the starter till you feel air[compression] start to come out of the plug hole
2-then,align the balancer mark to 0deg tdc..now you have the #1 piston up on the compression stroke
3-now,install the distributer to where the rotor is pointing to the #1 plug wire terminal on the inside of the distributer cap..
now it is in time..

Expert:  Tims Auto Repair replied 11 months ago.

see.even though the timing chain may have been installed correctly and is in time,,the distributor can be 1/2 turn out[180deg]

Customer: replied 11 months ago.
Yeah I know all that but would dist cause that massive fuel dump?
Expert:  Tims Auto Repair replied 11 months ago.

no..but it should have at the least fired up even if it was getting too much gas..

a few things could vcause it to get too much fuel.

1-too much fuelpressure-make sure the fuel return line isnt kinked

2-the map sensor

3-the ecm[computer] itself

but sense it ran before the timing chain,,it makes me think it may be out of time

Customer: replied 11 months ago.
It probably is like I said I gotta chech that cause the guy who put it in didn't seem to understand what he was doing. Its hard for me to get back there cause I lost my leg last year but I'm going to have to go over that shit this morning to see what he did won't know if he got it right I'm prettysure it's not because it didn't start
Expert:  Tims Auto Repair replied 11 months ago.

yes,,i dont think it is correct either.

yes,you will need to check it to be sure

thanks

Expert:  Tims Auto Repair replied 11 months ago.
Customer: replied 11 months ago.
you think the fuel thing might be a kinked return or mapp or the even the even was just replaced about 1 1/2 year ago
Customer: replied 11 months ago.
Or the ecm not even stupid auto correct
Expert:  Tims Auto Repair replied 11 months ago.

well..

you will neeed to check the fuel pressure to determine if it is a pressure problem,,these should never have more than 13psi of regulated pressure..

again,first make sure it is in time..

then check the pressure,if pressure is good,then check the map sensor,make sure you have a vaccume to the map

Expert:  Tims Auto Repair replied 11 months ago.

if the pressure and the map is good,,then you will need to replace the ecm

Expert:  Tims Auto Repair replied 11 months ago.

thanks

Customer: replied 11 months ago.
Ok thanks
Expert:  Tims Auto Repair replied 11 months ago.

you are very wecome

Expert:  Tims Auto Repair replied 11 months ago.