How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Chevy expert Your Own Question
Chevy expert
Chevy expert, ASE Certified Technician
Category: Chevy
Satisfied Customers: 10370
Experience:  30 yrs experience ase cetified tech shop owner
Type Your Chevy Question Here...
Chevy expert is online now
A new question is answered every 9 seconds

97 chevy: diesel..started blowing..white smoke and loss of horsepower

Resolved Question:

i have a 97 chevy with a 6.5 diesel it started blowing black smoke and then changed to white smoke and loss of horsepower
Submitted: 7 years ago.
Category: Chevy
Expert:  Chevy expert replied 7 years ago.

this may be a faulty injector pump

Tests/Procedures:1. Test the ignition feed to the fuel solenoid driver module, or check the same ignition circuit at the Engine Shut Off (ESO) solenoid on top of the injection pump.

2. The ignition feed is a Pink wire and should remain above 12v with engine running and when the engine stalls.

3. If the voltage drops below 10v at the time of the engine stall, replace the ignition switch.

4. If the voltage is OK, go through checks as described in TSB #77-63-06A.

5. If these checks show OK, replace the fuel solenoid driver module on the side of the injection pump.

6. Be sure to transfer the resistor from the old module to the new module as shown in the TSB.
Potential Causes:Fuel Solenoid Driver Module
Ignition Switch
Injection Pump

Customer: replied 7 years ago.
what is tsb #77-63-06a
Expert:  Chevy expert replied 7 years ago.
here it is tsb
Customer: replied 7 years ago.

i forgot to tell you that it also has a miss coming from exhaust


Expert:  Chevy expert replied 7 years ago.
yes these are well known for bad injectors , pumps and solonoid drivers , the misfire is common
Chevy expert and 5 other Chevy Specialists are ready to help you