Cylinder Balance Test
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Cylinder Balance Test
Still trying to determine why my 1994 F-250 460 shakes badly between 1100 & 1400RPM. I am attempting to do a cylinder balance test. Have done KOEO test that passed. Proceeded to to KOER Test which passed. I have attempted several times to get the truck to do a cylinder balance test after the KOER test. I have tried tapping throttle right after codes are displayed. I have tried waiting about 30 seconds. I have also tried waiting about 2 minutes to tap gas. I cannot seem to get it to go into balance test mode. I am not sure how to tell if it is doing it though. No matter what I do it holds RPM at 1000 after KOER test for about 2 minutes then it will suddenly drop rpm to about 800 then surge to 1300 and then maintain RPM at about 8-900 from then on out. Anybody know a trick to get this test to start?
Cargo Master
Joined: Jan 2004
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From: Cook Forest and Irwin PA
u really need the SBDS system (try and find THAT anywhere!!!!) which will interface in a strange wonderful way with the EECIV and use the CAW to guestimate relative cylinder performance.
Cargo Master
Joined: Jan 2004
Posts: 2,512
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From: Cook Forest and Irwin PA
its not really on board, rather the responses are, but the data stream must go to a software engine in the SBDS who interprets and formats the display (when you actually see one you will see how far ahead of time the SBDS was)
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Fleet Mechanic
Joined: Mar 2005
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From: St Louis
Was going to say the Trucks didnt get the SEFI until 97 with the 4.6, these trucks were all Bank fired if I remember right unless you had mass air. Have you checked for a broken engine mount as a possible cause to the vibration?
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Cargo Master
Joined: Jan 2004
Posts: 2,512
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From: Cook Forest and Irwin PA
we discussed this here once before:
https://www.ford-trucks.com/forums/1...ance-test.html
like I said, find a working unit somewhere at a defunct dealer, with the cables, and fire it up. it will unlock the EECIV like you have never seen.
I have been looking around, but never find one.
https://www.ford-trucks.com/forums/1...ance-test.html
like I said, find a working unit somewhere at a defunct dealer, with the cables, and fire it up. it will unlock the EECIV like you have never seen.
I have been looking around, but never find one.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
The cylinder balance test, as you've found, is only built into sequential injected computers. Cutting 4 injectors at a time won't tell much on the batch injected engines 
. For the trucks, the MAF computers would have the cylinder balance test but no other EEC-IV truck computer (I do not know about the EEC-V OBD-II). The 5.0 HO in mustangs were able to do a cylinder balance test at least as far back as 1989.
As quaddriver is getting at, a cylinder balance test can be done using external equipment no matter if the engine is batch injected or sequential.
. For the trucks, the MAF computers would have the cylinder balance test but no other EEC-IV truck computer (I do not know about the EEC-V OBD-II). The 5.0 HO in mustangs were able to do a cylinder balance test at least as far back as 1989.As quaddriver is getting at, a cylinder balance test can be done using external equipment no matter if the engine is batch injected or sequential.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
And no it is not a California Truck.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
It must be a MAF computer, which would fit with my statement. If it's not MAF, then you have the only SEFI speed density truck computer I have ever heard of. What does California have to do with anything?
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
As far as California, only California 5.8L trucks have MAF and SEFI and they can do the cylinder balance test in 94 & 95. The non California 5.8 Trucks sold in the rest of the country are not SEFI and can not do the cylinder balance test.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
Right, SEFI computers have the cylinder balance test built into them. I'm not sure what was so confusing about what I said before. Only the MAF EEC-IV trucks could run a cylinder balance test because they are the only EEC-IV computers used in these trucks (87-95) that used sequential fuel injection. The EEC-V used in 96 was a completely different animal and I don't know its self diagnostic capability.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Right, SEFI computers have the cylinder balance test built into them. I'm not sure what was so confusing about what I said before. Only the MAF EEC-IV trucks could run a cylinder balance test because they are the only EEC-IV computers used in these trucks (87-95) that used sequential fuel injection. The EEC-V used in 96 was a completely different animal and I don't know its self diagnostic capability.
Somehow I was not getting that meaning out of what you said the other day, but I do now.
Sorry for the posts.