1987 Chevrolet V20 Engine Oil Pressure Switch and Sender Guide
If your oil pressure gauge is acting erratically, reading zero, or pegged high, this guide is for you.
- Your 1987 V20 likely has two oil pressure units; the sender for the gauge is often above the oil filter.
- Always confirm actual oil pressure with a mechanical gauge before replacing parts to rule out a serious engine issue.
- A gauge pegged at maximum pressure often points to a failed sender or a grounded signal wire.
- Standard Ignition and Rostra are reliable aftermarket brand choices for this part.
Is Your Oil Pressure Gauge Lying?
A faulty oil pressure sending unit is a common issue on Chevy trucks of this era. The symptoms can be alarming, but the fix is often straightforward. Before you suspect a major engine problem, it's wise to check this sensor. The most common signs of failure are an oil pressure gauge that reads zero, is stuck at the maximum reading, or bounces around unpredictably. You might also find oil leaking from the sensor itself, either from its body or through the electrical connector.
Confirm with a Mechanical Gauge
🎬 Watch: How to test oil pressure with a mechanical gaugeBefore replacing the sending unit, it is critical to verify the engine's actual oil pressure with a mechanical gauge. This will confirm whether you have a simple sensor issue or a more serious internal engine problem causing low oil pressure. Ignoring a true low-pressure situation can lead to catastrophic engine failure.
Choosing the Right Aftermarket Part
For a classic truck like the 1987 V20, aftermarket parts are the most common and accessible option. OEM parts may be difficult to source. Here’s a look at the available brands.
Brand Quality Tiers
- Good (Tier 1): Standard Ignition (SMP) and Rostra Powertrain are well-regarded aftermarket manufacturers. Standard has been making quality electrical components for decades and performs extensive testing. Rostra is an ISO-certified manufacturer that also produces parts for original equipment manufacturers, indicating a commitment to quality control. Either of these brands is a reliable choice for a durable replacement.
- Economy (Tier 2): Brands like Global Parts fall into the economy category. While they offer a cost-effective solution that will get your gauge working again, their long-term durability may not match that of the higher-tier brands. Reviews for these parts are often mixed or difficult to verify.
1987 Chevrolet V20 Oil Pressure Sender Replacement Cost
| Part Type | Price Range |
|---|---|
| New Aftermarket | $14.34 - $73.13 |
| Shop Labor | $50 - $100 |
Cost estimates are for the part only and do not include taxes or shop supplies. Labor costs can vary by location.
Frequently Asked Questions (FAQ)
Where is the oil pressure sending unit on my 1987 V20?
For 1987 models, especially those with TBI fuel injection, there are two common locations. The sending unit for the gauge is most often found on the lower driver's side of the engine block, just above the oil filter. 🎬 See this walkthrough for replacing the sender on TBI engines A second oil pressure switch (for the fuel pump circuit) is typically located at the top of the engine, behind the distributor. Always check both locations on your specific truck to identify the correct part.
Why does my gauge read max pressure all the time?
A gauge that is pegged high, even when the engine is off but the key is on, usually indicates a problem with the sending unit or the wiring. The signal wire may be shorted to ground, or the sender may have failed internally. Unplugging the wire from the sender should cause the gauge to drop to zero; if it does, the sender is likely the culprit.
🎬 Watch this guide to troubleshooting gauge and sending unit issuesCan I replace the oil pressure sender myself?
Yes, this is a DIY-friendly job for most home mechanics. Access is the main challenge. Once you locate the sender, you simply unplug the electrical connector and unscrew the unit with a wrench or a special oil pressure sender socket. Be careful not to damage the wiring or overtighten the new part.
Are there any recalls for the oil pressure switch on a 1987 Chevy V20?
No, searches of the NHTSA database did not find any recalls or technical service bulletins (TSBs) specifically related to the oil pressure switch or sending unit for the 1987 Chevrolet V20.
Helpful Videos
Technical Specifications
Varies by engine and whether the vehicle has a gauge or a warning light. The sender for the gauge is typically a canister-style unit with a single electrical terminal.
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.
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