2002 4.3l Sonoma idles rough. Put in a new dist cap, rotor & wires. Still rough idle. Changed the coil. Removed ICM and coil bracket. Replaced coil(oem). Now I get no crank, No spark..?

Asked by Aug 13, 2013 at 01:40 PM about the 2002 GMC Sonoma SL Ext Cab 2WD

Question type: Maintenance & Repair

2002 4.3l Sonoma idles rough. So I replaced dist cap, rotor & wires. Still rough idle. Then changed the coil. Removed ICM and coil bracket. Replaced coil(oem). Now I get no crank, No spark..?

4 Answers

7,195

Recheck all connections and grounds to make sure they are connected and grounded properly first. If the engine idled rough but ran, put the old coil back in and see what happens. You could have bought a "new" but already bad coil.

2 of 2 people found this helpful.

Mark, Thanks. I did try the old coil,,,but have the same condition either way. I have tried jumping it thinking maybe my battery is weak...but that does not work either. I wonder if there is some code that needs resetting. I'm told that the started should crank even if the coil were disconnected. It seems as though my coil change is not related to my no crank condition....???

415

You need to change your ignition control module. It is located inside the distributer. An AC Delco one will cost you aproximately $50.00 and a generic one will cost you in the $20.00 range. Your truck will fire right up. That little module controls the signals coming and going from the trucks cpu. so 1) charge your battery so you have a good battery to work with. 2)change the ignition control module. draw a diagram where all the wires come and go off it. 3)put cap and rotor back on 4) start up the truck. once the truck is running, if it does the same thing in a couple of weeks , you may have to replace a ignition control module again. If it does it again, replace the distributer, with a brand new one, NOT a rebuilt one. rebuilt ones may have the same problem, and all they did was replace the ignition control module and send it off. It's what happened to me. Now I have an extra distributer that's a year old, that I won't turn back in.

1 of 1 people found this helpful.

Victor, Thanks for the response. Actually the ICM is mounted on the same bracket the coil is(not in the distributor). I will take mine in and have it bench tested, but I don't have much hope it will fix my problem. Will a bad ICM really cause a ''no crank'' problem? I can see it causing a ''no start'' but not a ''no crank''. But thanks.... Old Jim

Your Answer

Sonoma

Looking for a Used Sonoma in your area?

CarGurus has 410 nationwide Sonoma listings starting at $2,200.

ZIP:

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    700
  • #2
    Mike Bonnell
    Reputation
    480
  • #3
    James Mayfield
    Reputation
    320
View All

Related Models For Sale

Used Chevrolet S-10
18 Great Deals out of 1,247 listings starting at $1,600
Used Ford Ranger
148 Great Deals out of 5,440 listings starting at $800
Used Toyota Tacoma
573 Great Deals out of 44,301 listings starting at $2,200
Used Ford F-150
2,566 Great Deals out of 195,338 listings starting at $1,300
Used Dodge Dakota
91 Great Deals out of 3,668 listings starting at $1,750
Used Chevrolet Silverado 1500
2,267 Great Deals out of 168,223 listings starting at $1,000
Used GMC Sierra 1500
998 Great Deals out of 66,241 listings starting at $2,495
Used Nissan Frontier
362 Great Deals out of 23,001 listings starting at $2,700
Used Dodge Ram 1500
357 Great Deals out of 10,824 listings starting at $1,500
Used Toyota Tundra
461 Great Deals out of 33,418 listings starting at $2,000
Used GMC Yukon
464 Great Deals out of 22,338 listings starting at $1,995
Used Ford Explorer Sport Trac
52 Great Deals out of 1,805 listings starting at $1,950
Used Chevrolet Tahoe
721 Great Deals out of 41,409 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.