C4 won't start, seems like its not getting fuel
#1
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My 1990 C4 won't start, first time in 8 years I have had a problem like this.
Ths battery is fine and it sounds like it's trying to start but nothing. I think I can eliminate the alarm as I replaced it three years ago with a brand new unit. I am thinking Fuel Pump or Coils (based on Adrians book). Is anyone an expert on this? Thanks
Ths battery is fine and it sounds like it's trying to start but nothing. I think I can eliminate the alarm as I replaced it three years ago with a brand new unit. I am thinking Fuel Pump or Coils (based on Adrians book). Is anyone an expert on this? Thanks
#2
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Sounds like the CLASSIC DME relay problem, where everything sees to work but the engine will not catch; often this relay prevents the pump working. Any Streather book or relevant website will tell you where it is: in the 993 the relay is in the front right side of the forward luggage compartment.
I had this problem recently in my car and years ago in a 964. Replace this one relay and you will be amazed that the engine starts up fine again
I had this problem recently in my car and years ago in a 964. Replace this one relay and you will be amazed that the engine starts up fine again
#6
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It's hard to tell. My C4 has a very loud brake boost pump too. I understand that the fuel pump is on the right side near the passenger door. I wasn't able to hear anything from there but I do hear a loud electrical sound coming from my engine compartment on the right side. It gets louder after the first 30 seconds or so then shuts off. I never noticed it before and I'm not sure if its related.
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#9
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My car broke down a couple of years ago. It was towed to the dealer (OPC) where they diagnosed it to a faulty clock, after replacing it with a new one, the car was running smoothly again...
#10
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Are there two fuel pumps (front and rear)? My PET shows two but everyone seems to discuss the front one.
Front 964 620 104 00
Rear 930 608 113 00
I was also thinking of picking up some starter fluid to see if I can get it to turn over, has anyone ever done this?
I actually have a new front pump that I picked up at a swap meet a few years ago. I will change it out this week to help eliminate possibilities (the current one is probably original).
I have had the car for seven years, this is what I know was done –
DME – Validated with a spare = ok
Alarm/immobilizer – new one installed three years ago
New Battery – one year ago
Clock repair done to fix airbag light (all connections re soldered) – one year ago
Coils – most likely original
Fuel pump – most likely original
Thanks
Front 964 620 104 00
Rear 930 608 113 00
I was also thinking of picking up some starter fluid to see if I can get it to turn over, has anyone ever done this?
I actually have a new front pump that I picked up at a swap meet a few years ago. I will change it out this week to help eliminate possibilities (the current one is probably original).
I have had the car for seven years, this is what I know was done –
DME – Validated with a spare = ok
Alarm/immobilizer – new one installed three years ago
New Battery – one year ago
Clock repair done to fix airbag light (all connections re soldered) – one year ago
Coils – most likely original
Fuel pump – most likely original
Thanks
#11
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I got it started and I have no idea what I did to fix it, I will try it again tomorrow to see if it starts cold.
I used some starter fluid and didn't have much success. Once it sounded like it was going to start but all other times I cranked it - nothing.
I unplugged and tried my backup DME, nothing. I removed and checked the fuses for the fuel pump and DME, they were fine. In the engine area i pushed on a few connectors, everything seemed fine.
I tried to start the car again after about 10 minutes of poking around and it started to turn over. I need to give it some gas while cranking it and it started. Some gray smoke came out and disappeared quickly. I was able to take it for a quick run and I stopped and started it a few time - no problem at all.
I'm not sure if the ether helped or not. Any ideas?
I used some starter fluid and didn't have much success. Once it sounded like it was going to start but all other times I cranked it - nothing.
I unplugged and tried my backup DME, nothing. I removed and checked the fuses for the fuel pump and DME, they were fine. In the engine area i pushed on a few connectors, everything seemed fine.
I tried to start the car again after about 10 minutes of poking around and it started to turn over. I need to give it some gas while cranking it and it started. Some gray smoke came out and disappeared quickly. I was able to take it for a quick run and I stopped and started it a few time - no problem at all.
I'm not sure if the ether helped or not. Any ideas?