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

9,835

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 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....???

535

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 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 2 nationwide Sonoma listings and the tools to find you a great deal.

Postal Code:

GMC Sonoma Experts

  • #1
    parkle
    Reputation
    910
  • #2
    Mike Bonnell
    Reputation
    540
  • #3
    James Mayfield
    Reputation
    350
View All

Find great deals from top-rated dealersTM

Search

Related Models For Sale

Used Chevrolet S-10
5 listings
Used Ford Ranger
4 Great Deals out of 1,096 listings starting at $3,950
Used Chevrolet Silverado 1500
87 Great Deals out of 14,763 listings starting at $1,995
Used Toyota Tacoma
28 Great Deals out of 1,227 listings starting at $6,888
Used GMC Sierra 1500
65 Great Deals out of 13,329 listings starting at $3,995
Used Ford F-150
125 Great Deals out of 14,216 listings starting at $2,000
Used Nissan Frontier
23 Great Deals out of 736 listings starting at $4,999
Used Dodge Dakota
90 listings starting at $4,995
Used Dodge Ram 1500
16 Great Deals out of 370 listings starting at $4,400
Used Jeep Grand Cherokee
67 Great Deals out of 4,459 listings starting at $3,495

Used Cars for Sale

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. Content will be removed if CarGurus becomes aware that it violates our policies.