Description
The PAI Industries 209984EX is a remanufactured exchange fuel injector for Cummins ISX 15.0L EPA07 (CM871) engines using the HPI (High Pressure Injection) unit-injector fuel system, with matching QSX industrial applications. It replaces Cummins injector 4088665 (also serviced as 4088665R / 4088665RX and interchangeable with 4076902), fitting CM871 CPLs including 0927, 1434, 2733, 2919, 2965, 3167, 3458, and 8660. Each unit is fully remanufactured and flow-tested to restore OEM injection pressure, timing, and spray pattern. This is an exchange part — a refundable core charge applies.
Symptoms of a Failing Fuel Injector
- Rough idle, misfire, or engine surge under light load
- White or black exhaust smoke, especially at idle or under acceleration
- Noticeable loss of power and worsening fuel economy
- Diesel knock or cylinder cutout on one or more cylinders
- Hard starting or long crank times
- Injector-related fault codes or failed cylinder cutout test
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 209984EX |
| Part Type | Fuel Injector Assembly (Remanufactured Exchange) |
| Fuel System | Cummins HPI (High Pressure Injection) unit injector |
| Engine Application | Cummins ISX 15.0L EPA07, CM871 (QSX counterpart applications) |
| CPLs (partial list) | 0927, 1434, 2733, 2919, 2965, 3167, 3458, 8660 |
| OEM Reference | Cummins 4088665 |
| Core Charge | Yes — refundable core charge applies (reman exchange program) |
Cross References
| Manufacturer | Part Number |
|---|---|
| Cummins | 4088665, 4088665R, 4088665RX |
| Cummins | 4076902 (interchange) |
| Delphi (reman exchange) | EX638665 |
| Interstate-McBee (reman) | R-4088665 |
| PAI Industries | 209984X (standard reman line) |
Applications
- Cummins ISX 15.0L EPA07 (CM871 ECM), 2007–2010 on-highway trucks — Kenworth, Peterbilt, Freightliner, International, Volvo/Mack applications with ISX EPA07 power
- Cummins QSX EPA07-era industrial counterparts (verify by CPL)
Verify part number and engine application before ordering to confirm fitment. Confirm your injector part number against your engine serial number or CPL — CM871 EPA07 engines use different injectors than earlier CM570/CM870 or later CM2250 (XPI common rail) engines.
