Poor results
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Elder User
Joined: Apr 2005
Posts: 882
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From: Wichita
Poor results
I used a can of Seafoam in my '92 4.0 like the instructions say. Actually, I added more like a pint to the brake booster vacumn line and then put the rest in the tank. I was hoping the de-carbonizing would let me get back to using regular gas.
I get pinging now using plus-grade gas with the A/C on when I didn't used to before the treatment. Will this go away? The 89 octane used to prevent the pinging in the summer.
I get pinging now using plus-grade gas with the A/C on when I didn't used to before the treatment. Will this go away? The 89 octane used to prevent the pinging in the summer.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
has all the Seafoam in the gas passed thru, usually takes 2-3 tanks to clear all out? Seafoam in fuel can cause pre ignition.
pull codes on ECU, may have bad injector or other problem that will put out a code.
don't think any of the Aero 4L ever were designed with a mechanical distributor but timing could be off in ECU programming. Ford played around with the ECU/PCM programming for several years on the 4L trying to get it right. Believe the 4L ECU/PCM electronic distributor sets idle timing at 10d BTDC with operating temp engine.
disconnect negative battery lead for 10 minutes so that ECU/PCM clears NOVRAM and defaults back to default factory programming and relearns parameters for your engine specifics.
pinging can also be caused by too hot a heat range of spark plug. pull plugs and check lt. tan or gray is good, all look the same, no blisters or large deposits? sometimes deposits can become lodged under the ground lug of plug that will not come out with Seafoam decarbonizing that will heat up and cause pre ignition.
Use only Autolite part # APP765 or Motorcraft Double Plats in the 4L, pre gapped to 0.054" but double check, someone is always opening boxes in store and dropping plugs.
try a pint of water down the brake booster tube, slow pour at 2 to 3,000 rpm.
pull codes on ECU, may have bad injector or other problem that will put out a code.
don't think any of the Aero 4L ever were designed with a mechanical distributor but timing could be off in ECU programming. Ford played around with the ECU/PCM programming for several years on the 4L trying to get it right. Believe the 4L ECU/PCM electronic distributor sets idle timing at 10d BTDC with operating temp engine.
disconnect negative battery lead for 10 minutes so that ECU/PCM clears NOVRAM and defaults back to default factory programming and relearns parameters for your engine specifics.
pinging can also be caused by too hot a heat range of spark plug. pull plugs and check lt. tan or gray is good, all look the same, no blisters or large deposits? sometimes deposits can become lodged under the ground lug of plug that will not come out with Seafoam decarbonizing that will heat up and cause pre ignition.
Use only Autolite part # APP765 or Motorcraft Double Plats in the 4L, pre gapped to 0.054" but double check, someone is always opening boxes in store and dropping plugs.
try a pint of water down the brake booster tube, slow pour at 2 to 3,000 rpm.
Last edited by 96_4wdr; Aug 14, 2005 at 12:19 AM.
