Lack Of Power/Sluggish
Check listed items as follows:
- Check powertrain control module power and ground circuits. On Grand Cherokee, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - GRAND CHEROKEE article. On Liberty, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - LIBERTY article. On Wrangler, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in SYSTEM & COMPONENT TESTING - LIBERTY article.
- Check fuel pressure. See FUEL PRESSURE TEST under FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES article.
- Check engine coolant temperature sensor calibration. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.
- Check throttle position sensor calibration. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.
- Check manifold absolute pressure sensor. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.
- Check idle air control motor operation. Perform appropriate diagnostic test. On Grand Cherokee, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - GRAND CHEROKEE article. On Liberty, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - LIBERTY article. On Wrangler, see DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - WRANGLER article.