1987 GMC R1500 Distributor Ignition Pickup Replacement and Diagnosis
If your classic R1500 truck cranks but won't start, a failed distributor pickup coil is a likely culprit.
- A failed pickup coil is a very common cause of a 'crank-no-start' condition on these trucks.
- Replacement is an involved job that requires removing the distributor and then completely disassembling it.
- You must reset the engine's ignition timing with a timing light after the repair is complete.
- Both Standard Ignition and Delphi are reputable aftermarket brands for this specific part.
Is Your 1987 GMC R1500 Ignition Pickup Failing?
On a classic truck like the 1987 R1500, ignition components wear out. The pickup coil sits inside the distributor, where it's exposed to years of engine heat. This heat can cause the coil's internal windings or its wire insulation to break down, leading to frustrating ignition problems. The most common signs of failure are a sudden no-spark condition or an engine that stalls unexpectedly.
Symptoms of a Bad Distributor Pickup Coil
- Crank, No Start: The engine turns over but never fires up. This is the most definitive symptom of a complete pickup coil failure, as no signal is being sent to create spark.
- Engine Stalls When Hot: The truck may start and run fine, but then stall suddenly after it warms up. After cooling down, it might restart. This points to an intermittent failure in the coil.
- Stumbling and Misfiring: If the pickup coil is sending a weak or erratic signal, it can cause the engine to hesitate, misfire, or run rough, especially under acceleration.
- No Spark From Ignition Coil: A key diagnostic step is to check for spark coming from the main ignition coil wire. If there is no spark, and the coil itself has power, the pickup coil or ignition module is the likely cause.
Check Other Components First
A no-spark condition can also be caused by a bad ignition control module (ICM), ignition coil, distributor cap, or rotor. It's common practice to test or replace the ICM when replacing the pickup coil, as they work together and are located in the same area.
Choosing the Right Aftermarket Pickup Coil
For the 1987 GMC R1500, original equipment (OEM) parts are generally not available. The aftermarket offers reliable solutions from well-known brands.
- Standard Ignition (Standard Motor Products): SMP is a long-standing brand with a good reputation for ignition components for American vehicles. They are often considered a quality choice in the aftermarket.
- Delphi: Originally a GM parts division, Delphi is another established brand. While some parts are now sourced globally, they are still seen as a respectable name in ignition systems.
Both Delphi and Standard Ignition are solid choices for this part. The most important factor is to avoid generic, unbranded parts. The replacement process is involved, so you don't want to risk having to do the job twice due to a low-quality part failing prematurely.
Replacement Cost
| Part Type | Price Range |
|---|---|
| New Aftermarket Pickup Coil | $28.95 - $29.83 |
| Shop Labor | $180 - $360 |
Cost estimates are for the part and labor only and do not include taxes, shop fees, or costs of other related parts that may be replaced at the same time.
Frequently Asked Questions (FAQ)
Can I replace just the pickup coil, or do I need a whole new distributor?
You can replace just the pickup coil. However, it requires completely removing the distributor from the engine and disassembling it on a workbench. Given the age of the vehicle, inspect the distributor shaft for excessive play and the drive gear for wear. If other components are worn, replacing the entire distributor assembly might be a more time-effective repair.
Is replacing the ignition pickup coil a DIY job?
This is a feasible DIY job for someone with moderate mechanical experience. It requires tools like a punch to remove the distributor gear's roll pin, and you must be comfortable with removing and reinstalling a distributor. The most critical part of the job is setting the ignition timing correctly after reinstallation.
Do I have to reset the timing after replacing the pickup coil?
Yes, absolutely. Because you have to remove the distributor to access the coil, you must reset the base ignition timing with a timing light after you put everything back together. Failure to do so will result in poor performance, no-start conditions, or potential engine damage.
What are common mistakes when replacing a pickup coil?
The biggest mistakes are not marking the distributor's position before removal and not setting the timing correctly upon reinstallation. It's also easy to lose the small washers and roll pin during disassembly on the workbench. Finally, make sure the new coil's wires are routed correctly and don't get pinched inside the distributor housing.
Technical Specifications
Located inside the distributor assembly. Generates an AC pulse signal for the ignition control module.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- GMC R1500: