- #70 of 142
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98 Blazer steady speed it Misfires
by doc_john_13
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Apr 30, 2006 (2:17 pm)
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Hello,
I have a 1998 Chevy Blazer. The Idle is fine, the acceleration is fine.
But when you get it up to a steady speed it Misfires.
I have changed spark plugs, and plug wires. Replaced the fuel filter.
Ran injector cleaner time and time again.
I don't know what else to do. Can you PLEASE help me?
thank's
John
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- #71 of 142
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Re: 98 Blazer steady speed it Misfires [doc_john_13]
by tidester HOST
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Apr 30, 2006 (6:56 pm)
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Replying to: doc_john_13 (Apr 30, 2006 2:17 pm)
You'll have a far better chance of getting help if you post your message where other Blazer owner's will read it. You can find them here: Chevy Blazer/GMC Jimmy: Problems & Solutions
tidester, host
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- #73 of 142
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Re: 98 Blazer steady speed it Misfires [doc_john_13]
by waynediehl
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Jan 03, 2007 (8:01 pm)
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Replying to: doc_john_13 (Apr 30, 2006 2:17 pm)
Hi i had the same problem with my truck then it started poping codes saying a muti port misfire. I went to a shop. They told me it was my injectors. I did not think that was right so i tried acouple of things. There is a controll module in the distributer it cost about 40 dollers and after i changed that the problem went away. But the damege was done it fried my cat I cant remember what the part was called. But you can ask your local parts store. P.S my motor is a 4.3 L v6 with the delpi system.
Anyway good luck hope it helps.
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- #74 of 142
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Re: 98 Blazer steady speed it Misfires [waynediehl]
by repairdog
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Jan 04, 2007 (2:26 am)
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Replying to: waynediehl (Jan 03, 2007 8:01 pm)
Must have been the cam position sensor in the distributor. Ignition module is mounted on the coil on newer models. The random misfire P0300 can be injectors, cap/rotor, coil, ign mod, vac leak, and a few others so this is way a good dealer scan can save you money - if they can actually spot the cause - some never pop a code and only occur at certain throttle conditions. Mine was a crank sensor that threw timing off so at full throttle leaned the fuel mix out and misfires in all cylinders. So a lean mixture due to failing fuel pump can also cause this. Good you found it.
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- #75 of 142
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Engine missfire
by bladeturner
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Feb 22, 2007 (11:10 pm)
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My 99 S-10 Blazer engine missfires (4.3liter tbi) when cold but runs great when warmed up. One shop said this is caused by the ECM. No codes showing and all sensors checked good. Milage is 204,000+ Please help!!
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- #76 of 142
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Engine misfire
by lynderae
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Feb 23, 2007 (9:47 pm)
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Did you have to pull the whole distibutor. If not how do you get the module from under the metal piece? I pulled the rotor and the piece is directly under it. I removed the screws in the module but it wont slip out
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- #77 of 142
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Re: Engine misfire [lynderae]
by repairdog
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Feb 24, 2007 (3:52 am)
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Replying to: lynderae (Feb 23, 2007 9:47 pm)
same as other posts answer.
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- #78 of 142
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Re: Engine missfire [bladeturner]
by repairdog
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Feb 24, 2007 (3:56 am)
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Replying to: bladeturner (Feb 22, 2007 11:10 pm)
Could be lots of things at that mileage. Fuel pressure needs to be 60psi for cold start so that is one to check first and thats usually the pump in the tank. Then on to a full tuneup with cap/rotor, plugs, wires, fuel filter, air, PCV, clean MAF sensor, etc you get the picture. Then possible wiring or sensor, connector, etc.
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