ENG.MISS, BACKFIRE, HESITATION DELCO 'TYPE II'/ 'DIS' COILS. Cadillac Cimarron 1986

For 1990-2009 cars

# ENG.MISS, BACKFIRE, HESITATION DELCO 'TYPE II'/ 'DIS' COILS

#### MODELS AFFECTED: 1987 CIMARRON

Some 1987 Cimarrons may experience an engine miss, stall, hesitation, backfire or crank but no start condition.

This condition may be caused by improper resistance or an open in the secondary windings of the distributorless ignition coil(s) Figure 1). If the above condition is experienced on a 1987 Cimarron, the resistance of the individual ignition coils should be checked as follows:

1. Measure coil resistance with the Kent-Moore High Impedance Digital Volt Ohm Meter, J-34029-A, or equivalent.

2. Set the meter on the 20k scale.

3. Remove both spark plug wires from an individual coil.

4. Measure the resistance across the coil towers (Figure 1). The resistance of the coil may have to be measured hot and cold as some coils show an acceptable reading cold.

5. Replace an individual coil if: - It measures lower than 5000 ohms (5.0 on the meter), - It measures greater than 7000 ohms (7.0 on the meter), - It is open cicuited ("OL" on the meter).

6. Repeat for the remaining coils.

Individual coils (P/N 10497771, Group 2.170) may be serviced separately.

For warranty purposes, use Labor Operation T6237 at 0.5 hour.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.