20 Most Recent 1993 Audi 90 Questions & Answers

We will star a list of what is good.and what controls spark
1. crank sensor .you done it
2.ignition control module. located on the center of bulkhead,behind intake air hose
3.coils. you tested it.
4.ECM located under passenger side foot well

ECM no you got fuel,so lets leave it out
cranksensor okay you replaced it
ICM ignition control moduel.
no spark you cover everthing. has to be a loose or no contact connection somewhere, you covered it all.you might want to tap on the ecm., or check the fuse for power to junction the ones in the hood area those can blow and not give power to ignition system

I remember doing this years ago. Remove thermostat from the car and drop it into a pot and then pour boiling water over it. If it's good you will see it change shape as the bellows function. If this doesn't happen replace it. Just bear in mind that the Audi can't be driven without a thermostat, so if you have no other transport see if you can buy a replacement thermostat on a sale or return basis!

faulty thermostats show as two things stuck close --overheating with in 10 minutes of driving stuck open--- not reaching operating temperature with in 20 minutes of driving the test is to remove it have test it as per instructions for testing thermostats

There are dozens of possibilities from as simple as a bad pressure cap or low coolant level to as bad as a cracked engine block. Knowing the conditions that cause the overheat would help diagnose, here's some basics--assuming the coolant is full. Only overheats at low speed is generally an airflow problem: fan not running because of a fuse, relay, temperature switch, or dead fan motor. Only overheats at high speed is generally a coolant flow problem: radiator is plugged up, faulty thermostat, water pump vanes damaged. Tell us anything you've checked, any recent repairs done, and the conditions under which it overheats. If you need further help, I’m available over the phone at https://www.6ya.com/expert/oscar_403cc49e0f00cda7

Are they blinking from the moment you start or only after it's overheating? Replacing the relay as well as addressing any other obvious stuff would be the first step. Check coolant level and condition, assure the pressure cap is good and there's no leaks. If you need further help, I’m available over the phone at https://www.6ya.com/expert/oscar_403cc49e0f00cda7

First of all check the fan fuse to c if it's ok if it is then replace your fan switch on the side of the radiator cause that tells the fan when to come and it's a common fault on most vw cars if all else fails u will need to test and c if the fan is still working,u can check that by either putting direct power to the fans wiring if it does work then change the thermostat

sounds like your high/low switch has become defective may be in your steering colonm or some be be at the lower part of colonm and possibly actuated by a rod.

IT IS BRKEN......U ARE CORRECT U NEED TO CHANGE IT.......

the "timing marks" on audi"s are on the cam sprockets. large holes on the lobes of the camshaft gears are supposed to face each other when cylinder 3 is at TDC the crankshaft has an arrow that needs to be aligned as well. see pics for reference

I assume from your description that the fan will run until the battery is dead?

Sounds like your fan control relay (underhood, large fuse panel/box) or fan control switch is stuck. Both very simple to replace.

Fan control relay

Fan control switch

I hope this helps

you could of shook your fuses loose

It really could be anything. Most likely an electrical issue. Check all your fuses and relays, be sure they're all snug. Check the spark plug wires, distributor cap wires, look for loose wiring harnesses everywhere (especially to the fuel pum0). Bottom line, something came loose and you're going to have to do some searching to find it.

it is a vacuum hose that is disconnected. if you can find the hoses under the dash you can see what is disconnected. You can also purchase a Haynes Manual and that will help diagnose any problem, or spend a little $ and have a pro look at it. It wouldn't be that expensive, since it's a simple fix.

The engine is a v6