Injectors blowing fuses? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Cadillac When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 11-13-2011, 06:06 PM   #1
Junior Member
Thread Starter
 
Join Date: Mar 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Potlatch is on a distinguished road
Default Injectors blowing fuses?

My 1991 seville keeps blowing one of the two 7.5amp injector fuses. 10amp doesn't blow Does this mean
I have a bad injector? How do I find out which one? Or perhaps are there other than
half the injectors on this circuit which might be blowing the fuse?
Thanks
Potlatch
Potlatch is offline   Reply With Quote
Old 11-13-2011, 07:16 PM   #2
-- SITE DONATOR --
True Car Nut
 
ymmot04's Avatar
 
Join Date: May 2009
Posts: 4,638
Thanked 5 Times in 4 Posts
ymmot04 is a glorious beacon of lightymmot04 is a glorious beacon of lightymmot04 is a glorious beacon of lightymmot04 is a glorious beacon of lightymmot04 is a glorious beacon of lightymmot04 is a glorious beacon of light
Default

Have you inspected the wiring on the injectors to make sure none of the wires are smashed and grounding out on something or maybe frayed or cut?
ymmot04 is offline   Reply With Quote
Old 11-14-2011, 10:11 AM   #3
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

If you want to invest a few fuses, you could try disconnecting the injectors one at a time, start the engine, and see if the fuse doesn't blow when a particular injector is disconnected. Then you could switch injectors around and see if the problem stays with the wiring or moves with the injector.

Seems like a lot of work, but electrical shorts can be difficult to track down. Start with a general inspection of all wiring in the engine compartment to see if it is something obvious before you start pulling injectors.
2kg4u is offline   Reply With Quote
Old 11-14-2011, 06:03 PM   #4
Junior Member
Thread Starter
 
Join Date: Mar 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Potlatch is on a distinguished road
Default

Thanks for your advice. It doesn't blow the 7.5 amp except after some driving. 200 miles this weekend with 10amp fuse and no problem; however I never really pushed it hard. And as I recall both times it blew was after a full-throttle event. The shop manual and wiring diagrams don't show anything on the
circuit than the 4 injectors. Anyone know if there'* more on that circuit? I mean it does run fine, altho
NOX emissions are very high, one injector is 0.2 ohns while others on that circuit are 1.0-1.3 ohms;
High NOX suggests lean, right? And I'd almost swear there'* a single cyl denotating on throttle tip-in..
Would all suggest one lean,dirty, failed injector? Of course, I can R&R the four suspects
Potlatch is offline   Reply With Quote
Old 11-15-2011, 03:19 AM   #5
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

I would be inclined to suspect the 1 injector that is different than all the rest. Lower ohms indicates closer to short I believe. Maybe switch that injector with one from the other side to see if the problem moves?
rjolly87 is offline   Reply With Quote
Old 11-15-2011, 11:44 AM   #6
Senior Member

True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,804
Thanked 220 Times in 181 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

I agree. Switch the injector with the lower resistance to the other circuit and see if the problem follows the injector.
2kg4u is offline   Reply With Quote
Old 11-17-2011, 04:46 PM   #7
Junior Member
Thread Starter
 
Join Date: Mar 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Potlatch is on a distinguished road
Default

THANKS! EXCELLENT IDEA. i WILL SWITCH AND LET YOU KNOW
Potlatch is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
97 bonneville SE radiator fan keeps blowing fuses. Rich53 Everything Electrical & Electronic 6 06-23-2007 11:46 AM
Kept blowing fuel injector fuses. bonniecruzer 1987-1991 5 12-14-2006 03:44 AM
Replaced Crank Sensor, now I am blowing Fuel Pump Fuses!!! jaye22 1992-1999 2 05-22-2006 06:02 PM
i keep blowing fuses? WTF GAMEOVER Everything Electrical & Electronic 5 03-26-2004 03:32 PM
Blowing fuses Mayhem_3 Audio (and aftermarket electronics) 8 05-04-2003 09:28 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -4. The time now is 01:24 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.