87 suburban no power under acceleration


Old 03-01-04, 06:57 PM
Visiting Guest
Posts: n/a
87 suburban no power under acceleration

I have replaced the control mod ,coil, dist cap & rotor, pickup coil, plugs & wires.I have set the timing with a vac gauge and timing light. I have replaced the fuel pump and filter. I can't seem to get any good power under accelleration, any ideas?
It has a throttle body on a 350 with auto.
Sponsored Links
Old 03-01-04, 07:19 PM
Visiting Guest
Posts: n/a
my mine has gone blank.but anyway im thinking or trying to hows the injectors look.did you replace all the fuel filters.is the timing chain wore out.this is all i can think of right off hand .someone else will come along.so dont make any sudden decisions from what i said .
Old 03-01-04, 08:24 PM
Join Date: Aug 2003
Location: Cape Cod
Posts: 4,320
Does it "stumble" when accelerating, or just lacks power?
How many miles on this vehicle?
How's your tranny fluid level?
Can you do a cylinder compression check?
By throttle body do you mean it is a throttle body injection engine with (a) big injector(s) on the throttle body?
Do you know the service history?
The items you changed are the usual suspects
You'll need to dive a little deeper
Any more info might help
Old 03-01-04, 08:32 PM
Join Date: Feb 2004
Location: So Cal
Posts: 248
underpowered sub

Been awhile, but does it have a catalytic converter? It might be plugged.

Also might have a bad/disconnected knock sensor (if equipped). Had this happen to me on a '91 Sub. Knock sensor connector came off, timing retarded, BAM - NO POWER!

Just a few thoughts.


Old 03-03-04, 07:51 AM
Visiting Guest
Posts: n/a

THANKS TO ALL I found the problem. It ended up being the knock sensor. I replaced it and reset the timing. It runs just about like new.

THANKS AGAIN for all your input,keep up the good work.
Old 03-03-04, 04:35 PM
Join Date: Feb 2004
Location: So Cal
Posts: 248
87 sub fix


Glad we could help.


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes