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87 suburban no power under acceleration


funefarm's Avatar
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03-01-04, 06:57 PM   #1  
funefarm
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.

 
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03-01-04, 07:19 PM   #2  
fordman30
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 .

 
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03-01-04, 08:24 PM   #3  
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

 
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03-01-04, 08:32 PM   #4  
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.

HTH

Matt

 
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03-03-04, 07:51 AM   #5  
funefarm
87 SUBURBAN

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.

 
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03-03-04, 04:35 PM   #6  
87 sub fix

funefarm,

Glad we could help.

Matt

 
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