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jerking/loss of power/parts replaced....irritated

 
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jwalker
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PostPosted: Sat Feb 28, 2015 10:10 pm    Post subject: Grrrr ! jerking/loss of power/parts replaced....irritated Reply with quote

It started a little bit ago headed from Indiana to Virgina car started to loose power struggling to go up hills (loosing speed while going up hills) then half way home check engine light came on and started blinking.

(2003, 3.4L base)

burnt spot on a spark plug wire and replaced them all and the blinking CEL when away.

problem still happens with the loss of power and. Now it is worse where the car will jerk like its misfiring while driving and acting like it wants to die. To get up to speed I seem to have to feather the throttle as if it hangs up at certain speeds and hesitates to shift. The problems are only apparent while the motor is under a load. idle acts just fine.

Codes read at autozone was for EGR and multiple misfires. The CEL comes and goes.

Parts replaced: EGR, spark plugs, spark plug wires, MAP, MAF, TPS. several months ago I replaced the head gasket and LIM/UIM gaskets. as well as the rockers and lifter valves.

I have ignition coil packs to put in tomorrow.

I'm not too mad about replacing the parts because now i know they will be good for quite a while but I'm really wanting this fixed. Any and all suggestions will be great.
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Irish_alley
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PostPosted: Sun Mar 01, 2015 12:58 am    Post subject:   Reply with quote

a clogged cat maybe? if you can unscrew the o2 sensor before the cat and see if that helps relieve some of the back pressure

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Frank
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PostPosted: Sun Mar 01, 2015 6:32 am    Post subject:   Reply with quote

I had power issues when I had dirty air and fuel filters...easy maintenance items to replace that I had overlooked. I thought it was my fuel pump at the time. Rolling Eyes

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PostPosted: Sun Mar 01, 2015 8:16 am    Post subject:   Reply with quote

Irish_alley wrote:
a clogged cat maybe? if you can unscrew the o2 sensor before the cat and see if that helps relieve some of the back pressure


+1 check it and replace the cat before it cracks the exhaust manifolds
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PostPosted: Sun Mar 01, 2015 11:51 am    Post subject:   Reply with quote

I had a car that did the same thing. A coil change fixed it. I see you're doing that tomorrow. Hope that's it. GARY

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PostPosted: Mon Mar 02, 2015 1:52 am    Post subject:   Reply with quote

Irish_alley wrote:
a clogged cat maybe? if you can unscrew the o2 sensor before the cat and see if that helps relieve some of the back pressure


my vote also, if changing the coil pack doesn't fix it...

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jwalker
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PostPosted: Mon Mar 02, 2015 8:32 pm    Post subject: Bad ! update Reply with quote

alright so i swapped out the ignition coils but there is no change in the unruly behavior of the car. so my next step is what was suggested with the catalytic converter. I just want to clarify on how to check it with the O2 sensor. is it the O2 sensor that i can see just aft of the exhaust manifold that i am to take out? and should i leave it plugged in or take it out completely?
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PostPosted: Mon Mar 02, 2015 8:35 pm    Post subject:   Reply with quote

Thoughts here, FWIW.

Bad coil(s) will give the misfire, chug/surge, no power & CEL, but you will also be able to smell the raw gas in the exhaust. Its hard to miss the smell when 1/3 of the fuel isnt burning. Usually will idle fine until you put it under a load (driving). GM DIS coils are famous for grounding issues, its worth running a dedicated ground wire from the coil mounting plate to the block.

When you replaced the EGR, was the passage on the intake clear? You did a lot of work so I'm thinking you checked it, but maybe?? Mine was 100% clogged & throwing a random EGR code but running fine. I bought a new EGR & saw during replacement the passage was clogged.

Even with a clogged cat it will run fine till its warmed up. When it gets warm all goes to crap! If the cat is really clogged, you will hear it popping & snapping after your trying to drive it. Cats get hot, but it will be red-hot if its clogged.

Do you have a scanner? Not a code reader but something a little more like the Torque app or something? Cheap & worth it.

I'm guessing a coil issue. Good luck, post back your results! Wink


edit!!!

jwalker wrote:
alright so i swapped out the ignition coils but there is no change in the unruly behavior of the car. so my next step is what was suggested with the catalytic converter. I just want to clarify on how to check it with the O2 sensor. is it the O2 sensor that i can see just aft of the exhaust manifold that i am to take out? and should i leave it plugged in or take it out completely?


That changes things! You need to take it out completely to open up an exhaust passage. Its going to be loud also... The O2 sensor you are looking for is before the cat. Its not going to come out easy & will be a pain to reach.

I'm still not sold on the ignition coils. Can you run a temporary ground off the coil mounting plate to a ground before going after the O2 sensor?

What are the chances the plug wires are not correct? The car was fine until your trip right?

I'm thinking a ground issue...ground the heck out of that thing! Check your main battery ground & terminals....

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PostPosted: Tue Mar 03, 2015 10:05 am    Post subject:   Reply with quote

QuickNick wrote:
Thoughts here, FWIW.

Bad coil(s) will give the misfire, chug/surge, no power & CEL, but you will also be able to smell the raw gas in the exhaust. Its hard to miss the smell when 1/3 of the fuel isnt burning. Usually will idle fine until you put it under a load (driving). GM DIS coils are famous for grounding issues, its worth running a dedicated ground wire from the coil mounting plate to the block.

When you replaced the EGR, was the passage on the intake clear? You did a lot of work so I'm thinking you checked it, but maybe?? Mine was 100% clogged & throwing a random EGR code but running fine. I bought a new EGR & saw during replacement the passage was clogged.

Even with a clogged cat it will run fine till its warmed up. When it gets warm all goes to crap! If the cat is really clogged, you will hear it popping & snapping after your trying to drive it. Cats get hot, but it will be red-hot if its clogged.

Do you have a scanner? Not a code reader but something a little more like the Torque app or something? Cheap & worth it.

I'm guessing a coil issue. Good luck, post back your results! Wink


edit!!!

jwalker wrote:
alright so i swapped out the ignition coils but there is no change in the unruly behavior of the car. so my next step is what was suggested with the catalytic converter. I just want to clarify on how to check it with the O2 sensor. is it the O2 sensor that i can see just aft of the exhaust manifold that i am to take out? and should i leave it plugged in or take it out completely?


That changes things! You need to take it out completely to open up an exhaust passage. Its going to be loud also... The O2 sensor you are looking for is before the cat. Its not going to come out easy & will be a pain to reach.

I'm still not sold on the ignition coils. Can you run a temporary ground off the coil mounting plate to a ground before going after the O2 sensor?

What are the chances the plug wires are not correct? The car was fine until your trip right?

I'm thinking a ground issue...ground the heck out of that thing! Check your main battery ground & terminals....



I know what you mean on the front O2 sensor being a pain. If anyone doesn't want to deal with a specific O2 senor socket, just cut the wire coming off the old O2 sensor and use a regular socket.

Also with the spark plug wires and spark plugs, use only AC/Delco. I've used Bosch spark plugs and PRJ wires in the past and had problems. Pretty much anything ignition or emissions related use AC/Delco.

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bigdog60
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PostPosted: Tue Mar 03, 2015 6:54 pm    Post subject:   Reply with quote

Last time I removed one, I just unplugged it and used a box end wrench.

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PostPosted: Sun Sep 06, 2015 3:10 am    Post subject:   Reply with quote

yes you don't want to cut the wire on the ox sensor since removing is just for testing. you want to remove the one before the cat. you can also try drilling a small hole a little bigger then the straw on a spray can of throttle body cleaner. Drill the hole before the cat in the exhaust pipe. With the engine RUNNING squirt in the whole can pulling the can out and in slightly. Make sure to have the motor running.

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