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

6,725

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 out of 2 people think this is 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....???

385

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 out of 1 people think this is 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

Add photo

Related Questions

  • 2002 gmc Sonoma crank no start 5 answers

    I replaced a leaky timing cover on my 2002 gmc Sonoma and it cranks but will not start. the engine has 5000 miles, it is a crate motor I put in last year, the crank shaft position sensor is new and so...

    2002 GMC Sonoma SLS 2WD

    -

    Maintenance & Repair

  • Engine cranks but no spark

    The truck has 155k. I did the intake manifold gasket and had put everything back together using red gasket maker. The battery was weak from the truck sitting without being started. Keep in mind i...

    2000 GMC Sonoma SLE Ext Cab 4WD

    -

    Maintenance & Repair

  • Icm 1 answer

    My icm went out so i borrowed one till i gota new one on line. The part got here today and when i replaced it i got nothing. No spark. Turns over fine just no spark. So i put back my buddys icm ...

    2003 GMC Sonoma SLS Ext Cab SB

    -

    Maintenance & Repair

  • how to change an ignition coil 1 answer

    There is no spark at the spark plug wire

    1996 GMC Sonoma 2 Dr SLE Extended Cab SB

    -

    Maintenance & Repair

  • crank no fire 1 answer

    I have power to everything will crank over just won't fire replaced coil packs and no spark can any one help

    1998 GMC Sonoma 2 Dr SL Standard Cab LB

    -

    General

Sonoma

Looking for a Used Sonoma in your area?

CarGurus has 521 nationwide Sonoma listings starting at $1,100.

ZIP:

Search GMC Sonoma Questions

GMC Sonoma Experts

#1 parkle
parkle
Reputation 650
#2 Mike Bonnell
Mike Bonnell
Reputation 420
#3 James Mayfield
James Mayfield
Reputation 310
View All

Related Models For Sale

Used Chevrolet S-10
9 Great Deals out of 1,654 listings starting at $2,450
Used Ford Ranger
203 Great Deals out of 6,718 listings starting at $1,450
Used GMC Sierra 1500
938 Great Deals out of 62,237 listings starting at $1,395
Used Chevrolet Silverado 1500
2,283 Great Deals out of 155,210 listings starting at $1,395
Used Ford F-150
2,691 Great Deals out of 211,555 listings starting at $1,000
Used Toyota Tacoma
612 Great Deals out of 35,096 listings starting at $2,155
Used Dodge Dakota
120 Great Deals out of 4,292 listings starting at $1,495
Used Nissan Frontier
433 Great Deals out of 24,036 listings starting at $1,900
Used Dodge Ram 1500
528 Great Deals out of 12,814 listings starting at $1,995
Used Chevrolet Blazer
1,340 listings starting at $1,995
Used Jeep Wrangler
392 Great Deals out of 19,082 listings starting at $3,000
Used Chevrolet Camaro
283 Great Deals out of 38,314 listings starting at $1,250

Used Cars For Sale

2003 GMC Sonoma SL Ext Cab 2WD For Sale
10 listings starting at $3,500