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Message: <blockquote data-quote="H2Zero" data-source="post: 1586285" data-attributes="member: 17556">What all VW Enthusiast should know...CIS and CIS-E DiagnosticsCIS-E Jetronic & Motronic table located below! CIS TROUBLESHOOTING SYMPTON ProbableCause CORRECTIVEACTION 1. Cold start-Engine starts hard or fails to start. a.Cold start valve or thermo-time switch faultybFuel pump not runningc,Air flow sensor plate position incorrectd.Fuel pump pressure incorrect a. Test cold start valve and thermo-time switchb.Check fuel pump fuse & relayc. Inspect/adjustd.Test system and cold-control pressures 2.Hot start-Engine starts hard or fails to start a. Hot start pulse relay faultyb.Cold start valve leaking or operating continuallyc.Fuel pressure incorrectd.Air low sensor plate rest position incorrecta. Test/replace hot start pulse relayb. Test valve and thermo-time switchc. Test warm control pressured. Inspect/adjuste.Insufficient residual fuel pressuref.Fuel leak(s) e.Test residual pressure.Check fuel pump check valve and accumulator.f. Inspect all lines and fittings. 3.Engine misses and hesitates under load a. Fuel injector(s) cloggedb.Fuel pressure incorrectc.Fuel leak(s) a. Test injectors $ lines. Clean/replace.b.Test system pressure and warm control pressure. Replace pressure regulator if faultyc.Inspect all lines and fittings. 4. Engine starts but stalls at idle a.Incorrect fuel pressureb.Cold start valve leakingc.Auxiliary air regulator faultyd.Vacumn leak a.Test system/control pressuresb. Test/replacec.Test/replaced. Check for leaking hoses, cracks in air intake components,leaking valve cover. 5. Engine idles too fast a. Accelerator cable,pedal,Tbody bindingb. Auxiliary air valve faultyc.Air leaking past Tbody a.Inspect for worn or broken parts.b.Test/replacec.Inspect/adjust/replace Tbody 6. Hesitation during acceleration a.Vacumn leakb. Fuel injector(s) cloggedc.Cold start valve leakingd. Control plunger binding or fuel distributor faulty a. See 4db. See 3ac,See 4bd. Check sensor plate movement/clean control pluger/replace fuel distributor e. Airflow sensor plate misalignedf. Fuel pressure incorrectg.Idle mixture(%CO2)incorrect e.Inspect/adjustf.Check system/control pressure. Replace control pressur regulatorg. Check/adjust 7. Poor fuel economy a.Idle speed/timing/%CO out of adjustmentb.Cold start valve leakingc.Fuel pressure incorrect a. Check/adjustb.Test/replacec.See 6f 8.Engine runs after shutoff (diesels) a. Incorrect timing or faulty ignitiionbEngine overheated a. Adjust timing/See IGNITION sectionb. Check cooling system CIS-E and CIS-E MOTRONIC TROUBLESHOOTING SYMPTOM PROBABLECAUSE CORRECTIVEACTION 1. Cold Start-Engine fails to start or starts hard. a Cold start valve or thermo-time switch faultyB.Fuel pump not runningc. Airflow sensor plate rest position wrong Test cold start valve and thermo-time switch. b.Check fuse and relay.c. Inspect/adjust d. Fuel pressure incorrecte. Coolant temp sensor faulty or wire brokenf. Poor ignition system ground d.Check for leaks. Check differential press. regulator, system and control pressure.e. Test coolant temp. sensor. Test wiring for continuity.f. SEE ignition 2.Hot Start-Engine starts hard or fails to start a. Cold start valve leaking or operating continuously.b. Fuel pressure incorrect.c. Insufficient residual fuel pressure.d. Oxygen sensor system faulty a. Test cold start valve and thermo-time switch.b. See 1dc. Test/replace accumulator and fuel pump check valve.See EXHAUST/EMISSIONS e. Air flow sensor plate position incorrect.f. Fuel injector(s) faulty.g. Inadequate fuel deliveryh. Evaporative emission control system faulty on Motronic system. e. Inspect and adjust.f. Test/clean/replace.g.Test/replace pump.h. Check both evaporative control valves/replace. 3. Engine stalls or idles rough a. Fuel pressure incorrectb. Cold start valve faulty.c. Fuel injector(s) faulty.d. Coolant temperature sensor faulty or wiring to sensor broken.e.Vacumn(intake air) leak. a.See 1db.Test/replace valve.c.Test/clean/replace.d. Test sensor resistance. test continuity of wiring to sensor. e.Check valve cover, hoses, plenum, etc. f. Control plunger binding or fuel distributor faulty.g.Auxiliary air regulator faulty.h. Idle air stabilizer valve not operating.i. Airflow sensor plate position wrong.j. Incorrect enrichment. f. Test/clean control plunger. replace fuel distributor as necessary.g. Test/replace.h. Check wiring/idle switch. Clean ISV.i. Inspect and adjust.j. Check wiring/control current to DPR. 4. Engine misses or hesitates under load. a. Fuel injector(s) clogged.b. Fuel pressure incorrect.c. Oxygen sensor system faulty.d. Fuel leaks.e. Coolant temperature sensor faulty or wiring to sensor broken. a. Clean/test/replace.b. See 1dc. See EXHAUST/EMISSIONSd. Inspect lines/fittings. Correct leaks.e. See 3d 5. Engine idles too fast a. Accel. cable, pedal, throttle valve binding.b. Auxiliary air valve faulty.c. Idle boost valve(s) faulty.d. Idle air stabilizer valve faulty.e. Air bypassing throttle body.f. Evap. emission control faulty (Motronic) a. Check/repair/replace components.b. Test/replace.c. Test/replace.d. See 3he. Check hoses/fittings/tbody.f. Check both control valves/hoses. 6. Hesitation on acceleration a. Vacumn (intake air) leakb. Fuel injector(s) clogged.c. Cold start valve leaking.d. Control plunger binding/fuel distr. faulty.e. Airflow sensor plate misadjusted.f. Fuel pressure incorrect.g.Airflow sensor potentiometer faultyh. Inadequate fuel enrichment a. See 3eb. Clean/test/replace.c.Test/replace.d. See 3fe. Inspect/adjustf. See 1d.g. Test/adjust/repace.h. Check wiring/control current to DPR 7. Low power a. Coolant temperature sensor faulty or wiring broken.b. Fuel pressure incorrect.c. Throttle plate not opening fully. a. Test coolant sensor resistance values. Check for broken wiring to sensor.b. Check differential and system pressures. Check DPR.c. Check adjustment of throttle cable. d. Full throttle switch faulty or incorrectly adjusted.e. Airflow sensor screen damaged, clogged, or incorrectly installed. f. Air filter clogged. d. Check and adjust position of full throttle switch. Replace if faulty.e. Check installation. Clean/replace screen as necessary.f. Replace. 8. Poor fuel economy a. Idle speed,timing,CO mixture incorrect.b. Cold start valve leaking.c. Fuel pressure incorrect. a. Check/adjust all.b.Test/replace.c. See 7b. 9. Engine continues to run after shutoff (diesels) a. Incorrect timing/faulty ignition.b. Cold start valve leaking.c. Leaking fuel injector(s)d. Airflow plate/plunger misadjusted.e.Evaporative control valve faulty.f. Engine overheated. a. See IGNITIONb. Test/replacec. Clean/test/replace.d. Inspect/adjust.e. Check/replace vavle.f. See COOLING SYSTEM Technical Information</blockquote>

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