Coil Packs and RPMs - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 07-22-2009, 01:03 PM   #1
Registered Member
 
bowtieguy's Avatar
 
Join Date: Oct 2008
Posts: 1,873
Country: United States
Location: orlando, florida
Coil Packs and RPMs

my mechanic seems to have a theory on my intermitant acceleration issue(hesitation) on my 2000 chevy prizm. he believes it's a coil pack starting to go bad, but could not replicate the issue. since it cannot be isolated, he said we should wait for it to get worse.

2 questions...

he rode w/ me to see if we could replicate the problem. he then accused me of causing the issue because i shift ~2k rpms. he said this could cause coil pack issues among other things, and suggested 2500 as a shift point. i say that's garbage. your thoughts?

next. i think outside the box, so...what if i bought 1 coil pack, installed it, then drove to see what happens. if it continues, i'd pull it, move to the next one, and repeat until the bad one is found.

to me this is a better option than trying to drive home on 3cyl at some point when it finally fails. again, your thoughts?
__________________

bowtieguy is offline   Reply With Quote
Old 07-22-2009, 02:13 PM   #2
Registered Member
 
Join Date: Apr 2008
Posts: 689
Country: United States
I think your mechanic is crazy. What is RPM going to have to do with the life of a coil pack? My '88 Escort Pony has 496K miles and still has the orignal coil on it and I shift at low RPM's and have ever since I've owned it. If you have service/repair manual there's probably a proceedure to test your coil pack. I know they can be tested on my Escorts. You should be able to pick up a repair manual at Advance or Auto Zone for about $20. and is money well spent.
__________________

__________________
Hipermiler
#47 on my way to #1
Ford Man is offline   Reply With Quote
Old 07-22-2009, 02:28 PM   #3
Registered Member
 
GasSavers_RoadWarrior's Avatar
 
Join Date: Feb 2008
Posts: 1,652
I've got a similar issue on Wile-E don't know whether to finger the coil pack yet or not, it's driving me nuts.
__________________
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Old 07-22-2009, 04:26 PM   #4
Registered Member
 
Join Date: Dec 2007
Posts: 170
Country: United States
Your mechanic is not totally wrong.
The load on the engine will show any faults in the coil pack when the load is higher than normal and low RPM shifting will make this more obvious.

Try getting the car moving and when in second , let the engine speed drop to about 1500 then try a rapid acelleration. This will load the engine and if there is any problem with the coil pack it should show up then.

It may also be needing new plugs , leads or whatever so this is a guide only.

Cheers , Pete.
GasSavers_Pete is offline   Reply With Quote
Old 07-22-2009, 06:49 PM   #5
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
When diagnosing someone's equipment, it's hard to avoid blaming the weird thing that they do that seems like it should break stuff.

Your mechanic may be right or wrong, and your idea for testing sounds like a good idea to me.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 07-24-2009, 05:19 PM   #6
Registered Member
 
bowtieguy's Avatar
 
Join Date: Oct 2008
Posts: 1,873
Country: United States
Location: orlando, florida
still working on it...

replaced 1 coil pack--no change. going to the next one. if they weren't so expensive, i'd just replace them all.

it's so intermitant, it takes a while to get it to act up. so, this may take some time. the ethanol free gas test is on hold!
bowtieguy is offline   Reply With Quote
Old 07-26-2009, 08:20 PM   #7
Registered Member
 
kamesama980's Avatar
 
Join Date: Nov 2007
Posts: 742
Country: United States
Location: Columbus, IN, USA
Send a message via AIM to kamesama980 Send a message via Yahoo to kamesama980
lol then my trucks doomed... I go driving around in 4th (highest gear) at 1000-1500 all the time.

your mechanic is 1/2 nuts. You can't hurt your car shifting at 2k. a corolla/prizm should have no trouble whatsoever shifting there. BUT as mentioned, it may be revealing the problem.
__________________
-Russell
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
kamesama980 is offline   Reply With Quote
Old 07-27-2009, 05:18 AM   #8
Registered Member
 
theholycow's Avatar
 
Join Date: Apr 2008
Posts: 6,624
Country: United States
Send a message via ICQ to theholycow Send a message via AIM to theholycow Send a message via MSN to theholycow Send a message via Yahoo to theholycow
Quote:
Originally Posted by kamesama980 View Post
lol then my trucks doomed... I go driving around in 4th (highest gear) at 1000-1500 all the time.
Heh...me too, I rarely exceed 1500, and I use WOT most of the time. It's survived 25,000 miles so far.
__________________
This sig may return, some day.
theholycow is offline   Reply With Quote
Old 07-28-2009, 01:50 PM   #9
Registered Member
 
bowtieguy's Avatar
 
Join Date: Oct 2008
Posts: 1,873
Country: United States
Location: orlando, florida
just an FYI for you all...

i went to purchase a 2nd coil pack from the same part store, different town, to find out it was $10 more.

apparently the price varies even just a few miles away. anyway, i brought this to the attention of the guy at the parts counter, and he said he would match the price.

being frugal, many of us no doubt ask for competitor price matching. i had no idea it would even be needed w/in the same corp.
bowtieguy is offline   Reply With Quote
Old 08-03-2009, 08:05 AM   #10
Registered Member
 
kamesama980's Avatar
 
Join Date: Nov 2007
Posts: 742
Country: United States
Location: Columbus, IN, USA
Send a message via AIM to kamesama980 Send a message via Yahoo to kamesama980
What parts store is it? places like NAPA are all privately owned/operated. the corperate franchise sets their costs and some general rules of operation but actual markup and store operations are up to the individual owners discretion. places like Autozone, which are entirely corperate, will only vary by the local tax (and maybe shipping rates on special ordered parts)
__________________

__________________
-Russell
1991 Toyota Pickup 22R-E 2.4 I4/5 speed
1990 Toyota Cressida 7M-GE 3.0 I6/5-speed manual
mechanic, carpenter, stagehand, rigger, and know-it-all smartass
"You don't get to judge me for how I fix what you break"
kamesama980 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 09:06 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.