97 Blazer ENGINE PROBLEMS?? HELP ME!!!

[97blazerct]

I have a 97 blazer with a 4.3 vortec engine..

Today I was driving up a hill on the highway, going about 70mph with the RPM's around 2000. All of a sudden, I lost power and the engine began to rev high -- upto around or past 3000 RPM's and I almost totally lost power. I lost power so much so that I barely made it up this long gradual hill.
When i lost the power and the engine reved, The service engine soon light began to flash and then eventually went on permanatly.
It is almost as though my truck won't go when it is at 3000 RPM's..

Does anyone know what this could be? Somebody help me!

BTW... The only other time the engine light has come on was when it hit 95mph and 3000 RPM's a couple of weeks ago.

Thanks!

-Christine

[BlazerLT]

Get the codes scanned at autozone.

[97blazerct]

oh i am, my boyfriend works @ Advance Auto Parts and he brought the code computer home with him, now we just have to wait until he gets ti work this a.m. to print out the report and see what is wrong with it. It says it found 1 or more codes so we'll see...

[BlazerLT]

Good, please keep us posted.

[tom3]

Check transmission fluid?

[97blazerct]

well.. the code that came up was P0300 which is an engine cylander misfire code. The guy @ the dealership said it could be stupid things like a messed up plug, wire, or just water in the gas, OR it could be an ignition coil or a fuel injector. Well its running okay now i guess, my boyfriend drove around with it. Now i just need to figure out, some how, what the hell is wrong with it! The plugs and wires all appeared to be fine. I put dry gas in lastweek so I dont know?
Any other suggestions??
Could it have been a transmission problem? Because I had my tranny rebuilt and it has broken 4 times since and has been rebuilt 4 more times, Im about to bring the guy to court over him not being able to fix my truck, and if this could be a transmission problem even better, but would an engine light go on if the tranny slipped?

Any suggestions... THANKS! and i'll keep u posted

[BlazerLT]

Anyone else possibly think that it could be the 1997 faulty ignition switch?

[Alexxn 00 Si]

Hmmm worth a shot no ?

[BlazerLT]

Yip, transmission problem, weird codes, sounds like the 1997 ignition switch curse has struck again.

[derblazer]

Yup the ignition switch went out on you right in the middle of the river, haha. How fast does it oull away from the curb? Slow and you have to start in low and shift it manualy? Mine on the highway warunning around 3,000 rpm too a new ignition switch solved it. $123 at the dealer a bugger to put in and a lot cheaper than a transmission.

[MICHAEL FREIL]

Originally Posted by derblazer

Yup the ignition switch went out on you right in the middle of the river, haha. How fast does it oull away from the curb? Slow and you have to start in low and shift it manualy? Mine on the highway warunning around 3,000 rpm too a new ignition switch solved it. $123 at the dealer a bugger to put in and a lot cheaper than a transmission.

I have a 98 Chev. Blazer that I bought for my son. I have experienced the same damn S.E.S. code P0300 random cyl. misfire. The fuel pump was replaced by the auto dealer the day after we bought it, I have had my ace mechanic Dempsey change the plugs, AC Delco, wires, rotor, cap, and still get the SES light and code P0300, plus it runs rough. All of this was done in the past few weeks. My ignition switch is difficult to turn on. Did replacing your ignitiion switch cure your random misfire, and the P0300. Please advise a.s. a. p. this is bugging the heck out of me.
you can email me at [email protected]. thanks,

[dmbrisket 51]

Originally Posted by MICHAEL FREIL

I have a 98 Chev. Blazer that I bought for my son. I have experienced the same damn S.E.S. code P0300 random cyl. misfire. The fuel pump was replaced by the auto dealer the day after we bought it, I have had my ace mechanic Dempsey change the plugs, AC Delco, wires, rotor, cap, and still get the SES light and code P0300, plus it runs rough. All of this was done in the past few weeks. My ignition switch is difficult to turn on. Did replacing your ignitiion switch cure your random misfire, and the P0300. Please advise a.s. a. p. this is bugging the heck out of me.
you can email me at [email protected]. thanks,

the 97's are knowen to have "faulty" igniton switches, the 98's are not, but that is not saying that its not a possibility that it has gone bad

[buckeyboy]

Originally Posted by derblazer

Yup the ignition switch went out on you right in the middle of the river, haha. How fast does it oull away from the curb? Slow and you have to start in low and shift it manualy? Mine on the highway warunning around 3,000 rpm too a new ignition switch solved it. $123 at the dealer a bugger to put in and a lot cheaper than a transmission.

Yep I would try the ignition switch. the guy's on tis forum told me too I did and all my tranny problems went away for good. A good indication on mine was the engine light would come on and some times go off but always came back on again. and it felt like I was starting off in third gear. key would not come out of ignition.

[97blazerct]

Hey guys!! Well I've had my blazer for about 2 years... Anyway.. A few months ago my blazer got alittle "check engine light" happy and its been a neverending problem.

The details:

1997 chevrolet blazer ls 4x4 obviously wit the 4.3vortec.

Anyway.. When I drive it.. Shes usually fine.. BUT the last FOUR times I have driven up this one hill (its a long hill) around the middle of the hill the check engine light comes on and it starts chugging or like deiseling and I lose vacuum pressure to my brakes and have NO BRAKES! Anyway, when the engine light stops flashing it starts running alright again and i regain vacuum pressure to my brakes. Everytime I run a code check on the engine light it comes back as a cyl misfire.... Sometimes 6.. Sometimes 3&6.. I changed the plug, the coil back and im out of ideas!! The second to last time it happened my truck had a STRONG SMELL of something burning but i looked and nothing was burning or leaking (as far as i could see.) When it happens.... I first start to lose power.. Like the RPMS increase but no power is going to the engine.. Then the engine light starts flashing.. Then it starts chugging/deiseling, then i lose vacuum pressure and and no brakes and need to eigher stop or like pump the gas to keep it running. Then when I stop the engine light eventually goes solid and then it runs like normal again. It looks like the plugs may be running a little lean.
Anyway.. I conclude its only when Its reving ariound 2500rpms for more then a few seconds. Its SO scary because when I lose the vacuum pressure I have no brakes and I have almost plowed into cars infront of me a few times.

Does anyone have any suggestions asto what my problem may be?? Im a working college girl and dont have the time to worry about dying when i drive!! haha! Anyway.. Please help me out, any suggestions would be GREAT!!! I'm desprite for ideas. This is becoming B.S! I cant even drive home from my boyfriends house because everytime I go up this hill the damn thing breaks down.

my email is [email protected] and if you could Email me or reply to this and help me out i'd appreciate it!

[tom3]

My first guess would be a fuel delivery problem. Fuel filter or, worse, fuel pump about to go out. This year is noted for lousy fuel pump assemblies. I'd start with a filter.