Question about 1991 Audi 100

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No start when my 5 cyl is warm she won't start(fire) Turns over fine but I have to let her sit overnight then she starts even though the belts squeal for a minute and runs great until I shut her off. Then she turns over but not even close to firing

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This sounds like a computer issue or rotor issue- it could be the pick up in distributer electronic pick up in distributer- gets hot then signal won,t travel- cools down then o.k

Posted on Sep 27, 2008

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Posted on Jan 02, 2017

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1 Answer

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Can't find the source of the squeal


Year make and model ??
The belt could be glazed and slipping even if it is tight.
You could have a weak belt tensioner too.
The noise when the ac or heat is turned on can be the extra load from the ac compressor or the alternator. The compressor cycles on and off especially in defrost mode.
The load from the alternator is the first noise of the day. As the belt warms up it becomes better at handling the load of the accessories.
Even tho the belt looks fine, you may have to replace it to get rid of the noise.

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In the morning, turn key to on position for 5 seconds. Do not crank.Then turn off for 5 seconds. Repeat this about 5 times. Then try to start. If engine starts right up, the fuel pump check valve is bad. Meaning all fuel in fuel line is returning to the tank when car sits overnight. The only fix is to replace fuel pump. If that doesn't work, replace coolant temp. sensor for the computer. About a 12.00 part.

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You probably have the same issue as many Sentra owners- bleed off of fuel pressure. This would cause a hard starting condition when the vehicle sits overnight. See TSB# NTB05-052a for the procedure. This is a dealer-only repair (parts are not available aftermarket).

As for the squeal, I've seen a LOT of this- the belts on these vehicles are less than excellent quality. The belts might look fine and some mechanics will say that they don't need to be replaced, but they are noisy and they can't be quieted up even by overtensioning them. Replacement is the only repair. Aftermarket belts can also be very noisy, so I would suggest Original Equipment (Nissan) belts.

Hope this is helpful!!!


Nissan Scope Technician- 10+ years experience in Nissan dealership.

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