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Chevrolet Blazer Engine and Performance Problems

142 messages,  Last post on Nov 11, 2009 at 9:09 PM

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#71 of 142 Re: 98 Blazer steady speed it Misfires [doc_john_13] by tidester HOST Apr 30, 2006 (6:56 pm)
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
#73 of 142 Re: 98 Blazer steady speed it Misfires [doc_john_13] by waynediehl Jan 03, 2007 (8:01 pm)
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. Replies to this message: repairdog (Jan 04, 2007 2:26 am)
#74 of 142 Re: 98 Blazer steady speed it Misfires [waynediehl] by repairdog Jan 04, 2007 (2:26 am)
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.
#75 of 142 Engine missfire by bladeturner Feb 22, 2007 (11:10 pm)
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!! Replies to this message: repairdog (Feb 24, 2007 3:56 am)
#76 of 142 Engine misfire by lynderae Feb 23, 2007 (9:47 pm)
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 Replies to this message: repairdog (Feb 24, 2007 3:52 am)
#77 of 142 Re: Engine misfire [lynderae] by repairdog Feb 24, 2007 (3:52 am)
Replying to: lynderae (Feb 23, 2007 9:47 pm) same as other posts answer.
#78 of 142 Re: Engine missfire [bladeturner] by repairdog Feb 24, 2007 (3:56 am)
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.
#80 of 142 Melted vacuum lines by hayesatlbch Feb 09, 2007 (1:29 pm)
Color me unlucky ( I wasn't really stupid was I- no answer required on that )   My 86 S-15 Jimmy ( 1992 engine )311,000 miles, 2.8, started having a slow idle and stalling( ran fine) so I figured I would find the vacuum leak with starting fluid. Found it,(vacuum fittings on air cleaner) idle came up so I turned it off and walked away to find a small fire by the fire wall when I came back a few minutes later.   It could have been worse. The coil and electrical connectors on them were partly melted along with the insulation on the wires going to the connectors ( but they are identifible by going back a few inches) and the distributer cap melted up one post.    What is that box mounted with the coil with what looks like heat fins on it?   I will go to the Junk yard an get a coil ( I need the connectors on top too) along with that box I can't identify ) replace the distributer cap and then I am stuck.   Maybe I will get lucky and find the vacuum hoses and fittings also but I have the feeling that without something showing me where all the vacuum lines come from and go I am going to be in trouble. I ordered a Chilton Manuel maybe they will have a diagram.   Any ideas for someone who is kind of a parts replacer rather than a mechanic?   I am also posting as a Public Service Announcement that ether ( starting fluid ) can take some time to ignite so don't walk away soon. Replies to this message: repairdog (Feb 10, 2007 4:34 am)

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