Sounds like coolant sensor is dead and not feeding ECU brain proper information. Go to this link: http://www.members.tripod.com/~fuelie/intro.htm This is a great (only?) site for digifant cars and should help you with your problem(s).
The temp sending unit should be a small sensor with a single wire blade type connector on it coming off the head coolant pipe. You can ground this out while the key is in ON and the guage should move to full deflection. If it does then the sensor is faulty. If not then the guage or wiring is faulty. The other sensor on the coolant pipe with the two pin connector is the coolant sensor for the brain. Digifant operation is totally dependant on this sensor. Troubleshooting is a simple matter of comparing resistance readings to a chart based on temperature. At room temp 70deg it should read around 2.5Kohms. @ operating temp around 194deg lets say, it should be 250ohms. This sensor controls the cold start funtion via the ECU brain in the digifant system. If this sensor is dead then you will definately have hard starting problems. The ECU is also suspect but test out everything else first. Rich Blake 88 GTi16v 88 Jetta (Digifunk) -----Original Message----- From: Will K> <[email protected]> To: [email protected] <[email protected]> Date: Saturday, July 21, 2001 12:12 AM Subject: Hard Starting (new Jetta owner) >Hey guys, > I am the proud owner of my first VW. Its a 91 Jetta GL in fairly good >shape. Only trouble is a few engine bugs I need to work out. Thats where >you guys come in... > >1. It needs a new temp sensor. The guage on the dash doesn't work, and the >light is blinking. Would this cause irratic idle? I ordered a new one from >the dealership and it wont be in until monday. Which one is the one I need >to replace? Is it the one closest to the engine where the thermostat is? >There is a blue one and a black one (blue closest to the engine). > >2. Sometimes it is really hard to start, and will only start if I give it >lots of gas, but I can smell fuel before I give it gas. I was thinking a >leaking injector, but I am not sure. Could this be related to #1? I have >heard bad things about the 8v injection systems from this era, any ideas? > >Thanks for any help. I need it in order to make this car a good daily >driver... > >Will Keegan, Harrison Twp. MI >86 Shelby Omni GLHS #28 (turbo intercooled) >86 Omni GLH Turbo (just sold for the jetta) >91 Jetta GL 8v (needs some engine help) > > >_________________________________________________________________ >Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp > >_____________ >List Sponsor: http://www.netsville.com >To remove yourself from this list, send mail to [email protected] with 'unsubscribe a2_16v' in the body of your message >See us on the web at http://www.a2-16v.com >Visit the 16V Homepage at http://www.gti16v.org > _____________ List Sponsor: http://www.netsville.com To remove yourself from this list, send mail to [email protected] with 'unsubscribe a2_16v' in the body of your message See us on the web at http://www.a2-16v.com Visit the 16V Homepage at http://www.gti16v.org
