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Misfires?
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Gems
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PostPosted: Fri Dec 23, 2011 8:58 am    Post subject:  Misfires? Reply with quote

My 2001 Impala (3.8L) is having what feels to be a misfire problem, but I'm not sure... The symptoms are as follows... At cold the car runs great... After the engine is fully warmed up, and then under a light acceleration under load (like accelerating up a slight hill) I get what feels like a series of quick hesitations... It feels just like a fish bite on the end of a fishing line (if that analogy makes any sense)... When I let up on the gas or the road levels out it goes away... No CEL and no codes when I scan with my Actron code reader...

The car has 105,000 miles with what are probably original plugs and wires... I just bought a new set of ACDELCO plugs and wires and hope to change them next week... Any other ideas or thoughts?

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98ss
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PostPosted: Fri Dec 23, 2011 1:35 pm    Post subject:   Reply with quote

CAT could be starting to go.
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Gems
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PostPosted: Fri Dec 23, 2011 1:39 pm    Post subject:   Reply with quote

98ss wrote:
CAT could be starting to go.


CAT was changed about 4 years ago and paid for by GM...

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chibiblacksheep
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PostPosted: Fri Dec 23, 2011 1:59 pm    Post subject:   Reply with quote

Gems wrote:
98ss wrote:
CAT could be starting to go.


CAT was changed about 4 years ago and paid for by GM...


So a 4 year old cat can't possible be clogging again?

Last time you dropped the transmission pan and changed the filter/fluid?

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Gems
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PostPosted: Fri Dec 23, 2011 2:04 pm    Post subject:   Reply with quote

chibiblacksheep wrote:
Gems wrote:
98ss wrote:
CAT could be starting to go.


CAT was changed about 4 years ago and paid for by GM...


So a 4 year old cat can't possible be clogging again?

Last time you dropped the transmission pan and changed the filter/fluid?


Sure it's possible... When my CAT was clogging 4 years ago I experienced severe loss of power, bogging down, when accelerating... But no misfires...

Tranny fluid and filter changed in August when I thought I had a tranny problem... But a GM Tech II scan showed no tranny codes but a bad MAF... So the MAF was changed in August... Shifting back to normal...

I could be wrong, but this feels like an ignition problem... But comments on other possibilities are encouraged...

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PostPosted: Fri Dec 23, 2011 5:40 pm    Post subject:   Reply with quote

Its hard to believe you don't have a check engine light... it could be faulty plugs and/or wires, clogged fuel injector(s)
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Gems
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PostPosted: Fri Dec 23, 2011 5:57 pm    Post subject:   Reply with quote

PBnj wrote:
Its hard to believe you don't have a check engine light... it could be faulty plugs and/or wires, clogged fuel injector(s)


Right... No CEL and no DTC codes... The car runs good in local, side street driving and around town... But during my daily commute to work there is one exit ramp that curves right and slightly up hill... When I slow down to get on the ramp, and then accelerate up the hill, is when I feel what I am calling a misfire... Happens every day in the same spot... It actually feels like a hesitation, or fish bite jerk if you were holding onto a fishing rod and a fish took the bait... Silly analogy, but that's what it feels like...

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PostPosted: Fri Dec 23, 2011 7:12 pm    Post subject:   Reply with quote

Sometimes the check engine light can take awhile to pop up... your best bet is to get it scanned with a tech 2 or just wait for the cel

Have you been paying attention to your gas milage?
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Gems
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PostPosted: Fri Dec 23, 2011 7:19 pm    Post subject:   Reply with quote

PBnj wrote:
Sometimes the check engine light can take awhile to pop up... your best bet is to get it scanned with a tech 2 or just wait for the cel

Have you been paying attention to your gas milage?


Good question... I have not been paying attention to the gas mileage... Probably should...

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PostPosted: Fri Dec 23, 2011 11:44 pm    Post subject:   Reply with quote

I had exactly the same symptom with an old Cutlass, fish bite is a great description. New plugs and wires fixed it. I'm guessing the combo of accel plus hill and turn may have been opening a gap in the insulation of one wire, causing the misfire.

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PostPosted: Sat Dec 24, 2011 3:35 pm    Post subject:   Reply with quote

Jayme wrote:
I had exactly the same symptom with an old Cutlass, fish bite is a great description. New plugs and wires fixed it. I'm guessing the combo of accel plus hill and turn may have been opening a gap in the insulation of one wire, causing the misfire.


My stepson and I successfully changed out the rear plugs and wires... What a pain in the butt !!... Re-started the car to make sure we hooked everything back up correctly and didn't cross any wires... All seems good, but we will finish the front 3 plugs and wires on Monday... Time here for some Christmas Eve and Christmas with the family!! Here is a pic of the 3 old rear plugs...




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PostPosted: Sat Dec 24, 2011 10:41 pm    Post subject:   Reply with quote

Gems wrote:
Jayme wrote:
I had exactly the same symptom with an old Cutlass, fish bite is a great description. New plugs and wires fixed it. I'm guessing the combo of accel plus hill and turn may have been opening a gap in the insulation of one wire, causing the misfire.


My stepson and I successfully changed out the rear plugs and wires... What a pain in the butt !!... Re-started the car to make sure we hooked everything back up correctly and didn't cross any wires... All seems good, but we will finish the front 3 plugs and wires on Monday... Time here for some Christmas Eve and Christmas with the family!! Here is a pic of the 3 old rear plugs...





Ew! those are gross! way overdue....you should notice a huge improvement when you change the rest out..

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PostPosted: Tue Dec 27, 2011 12:40 pm    Post subject:   Reply with quote

billy101 wrote:
Gems wrote:
Jayme wrote:
I had exactly the same symptom with an old Cutlass, fish bite is a great description. New plugs and wires fixed it. I'm guessing the combo of accel plus hill and turn may have been opening a gap in the insulation of one wire, causing the misfire.


My stepson and I successfully changed out the rear plugs and wires... What a pain in the butt !!... Re-started the car to make sure we hooked everything back up correctly and didn't cross any wires... All seems good, but we will finish the front 3 plugs and wires on Monday... Time here for some Christmas Eve and Christmas with the family!! Here is a pic of the 3 old rear plugs...





Ew! those are gross! way overdue....you should notice a huge improvement when you change the rest out..


I hope to change the front 3 out today if the weather holds...

I also want to cover the wires with some type of split wire tubing... I see some of this on eBay but I'm not sure it has high enough temperature performance...

http://www.ebay.com/itm/1-4-Sp.....2c615e1978

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PostPosted: Tue Dec 27, 2011 12:49 pm    Post subject:   Reply with quote

I think a plugged cat can cause misfires on cylinder 6, but I'm not positive.

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PostPosted: Tue Dec 27, 2011 1:36 pm    Post subject:   Reply with quote

the split loom should work as long at is doenst come in direct contact with the manifolds. Ive had that stuff melt before and its nearly impossible to get off without grinding.

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