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vwbusbusvw
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Joined: December 07, 2005
Posts: 1337
Location: San Diego
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 Posted: Fri Mar 17, 2006 9:29 pm Post subject: Not much experience with Bays... |
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I have a '75 standard bus. About a week ago, it started getting hard to start. I went out today to start it, and it wouldn't catch. It turns over, (and over), but won't start. At first, it just needed a turn of the key. Now, if I turn it over, after about 10 seconds, it almost wants to start, but then quits. Lots of power from the battery. Getting spark. Fuel lines are clear. Is it a cold start sensor? Do '75's have them? If so, where are they on the engine? Are they easy to pick up from a shop, or is it something I have to order?
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1994 Dodge Neon w/supercharged 1500dp
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MedicTed
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Joined: August 12, 2005
Posts: 2110
Location: King of Prussia, PA
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| Posted: Sat Mar 18, 2006 5:57 am Post subject: |
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I'm not a fuel injection (FI) expert. But there are other questions to be asked. When was the last time it was tuned up (spark plugs, wires, points, etc)? What about the valve adjustment? Timing? As far as the FI system, I'll let someone more knowledgable handle that issue.
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Ted Wojton
70 VW Bus Westfalia camper
2003 GMC Sierra |
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Randy in Maine
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Joined: August 03, 2003
Posts: 34890
Location: The Beach
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| Posted: Sat Mar 18, 2006 5:59 am Post subject: |
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| I am going with ted on this one. Do what he said and check the points wih your handy dwell meter that is about to pay for itself. |
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germansupplyscott
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Joined: May 22, 2004
Posts: 7094
Location: toronto
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| Posted: Sat Mar 18, 2006 6:15 am Post subject: Re: Not much experience with Bays... |
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| vwbusbusvw wrote: |
| Is it a cold start sensor? Do '75's have them? If so, where are they on the engine? Are they easy to pick up from a shop, or is it something I have to order? |
start with the basics as others have said.
the cold start valve is on the rear of the intake plenum (the black bulb on top of the engine with the 4 intake runners branching off of it), it is a tee shape with two hoses off the sides and an electrical plug off the back. yes, if something is wrong with it that will cause hard starting. check the wiring to the CSV, there is a blue plastic plug on the rear of the valve. the CSV is combined with the thermotime switch to provide extra fuel at startup. the TTS is harder to see, it is buried under the plenum on the left of centre, right in front of the oil pressure switch.
many if not most FI issues are related to bad wiring, not component failure.
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vwmaniaman
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Joined: June 07, 2005
Posts: 562
Location: Grand Rivers,KY
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| Posted: Sat Mar 18, 2006 6:55 am Post subject: |
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| Make sure the cylinder head temperature sensor isn't open. That will make it impossible. Has it backfired? Airflow flap my be sticking and keeping fuel pump switch from staying on. |
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VWBusrepairman
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Joined: July 06, 2004
Posts: 4726
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| Posted: Sat Mar 18, 2006 8:12 am Post subject: Re: Not much experience with Bays... |
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| vwbusbusvw wrote: |
| Lots of power from the battery. Getting spark. Fuel lines are clear. Is it a cold start sensor? Do '75's have them? If so, where are they on the engine? Are they easy to pick up from a shop, or is it something I have to order? |
sounds like ignition is fine, but what about fuel? If it has fuel, fire, compression, correct timing, it has to start.
In my experience, when a fuel pump dies, it goes with no warning at all.
Will it not start at all now?
Bus depot, Bus Boys Inc., Mid America Motorworks all sell these parts. |
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vwbusbusvw
Banned
Joined: December 07, 2005
Posts: 1337
Location: San Diego
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| Posted: Sat Mar 18, 2006 12:34 pm Post subject: |
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Maybe I shouldn't have done this before checking all of the stuff you guys suggested - I sprayed some starting fluid into the intake, and the bus started right up. Now that the engine has warmed, I have no problem starting at all. I'll wait a few hours until it cools down, and try again. I did grab all the electrical connections, wiggled them, and make sure they were on tight. I also lubricated the flap near the airflow sensor.
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1994 Dodge Neon w/supercharged 1500dp
OMVWC
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VWBusrepairman
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Joined: July 06, 2004
Posts: 4726
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| Posted: Sat Mar 18, 2006 2:29 pm Post subject: |
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| vwbusbusvw wrote: |
| Maybe I shouldn't have done this before checking all of the stuff you guys suggested - I sprayed some starting fluid into the intake, and the bus started right up. Now that the engine has warmed, I have no problem starting at all. I'll wait a few hours until it cools down, and try again. I did grab all the electrical connections, wiggled them, and make sure they were on tight. I also lubricated the flap near the airflow sensor. |
wiggling wires isn't the way to check, but using a volt meter will be. Sounds as if the cold start valve isn't functioning. It must be tested along with the thermo-time switch...to verify that 12 volts is reaching it. If so, the part is faulty. The cold start only pulses for a few seconds but makes all the difference in the world for a quick, smooth start. |
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