930 HOT START PROBLEM
06-30-2007, 07:34 PM
#1
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930 HOT START PROBLEM
I have a 1984 930 with a hot start problem - have to turn it over for a couple of minutes before it catches. I have heard it could be the accumulator. Where do I start? If it is, where do I look for it? - thanks
07-01-2007, 06:22 PM
#4
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As Don mentioned you really need a pressure gauge. This is the only proper way to see if you are dropping pressure. It could also be the cold start switch in the chain housing, improper CO(AFR), control pressures and so on. Yes, a hard or no start when hot generally points to the accumulator and or check valve at the pump. I would start by checking residual system pressure after 10 minutes.
07-01-2007, 09:29 PM
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i have the same problem...starts fine when cold...and starts fine when hot if i just run in for coffee and start it right back up.
now...if i go to dinner and take an hour or so to start the car again, it takes a few minutes to start it and even then , it spits and sputters until all the cylanders seem to fire properly.
is there a process of elimination to go to?
now...if i go to dinner and take an hour or so to start the car again, it takes a few minutes to start it and even then , it spits and sputters until all the cylanders seem to fire properly.
is there a process of elimination to go to?
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07-03-2007, 04:18 PM
#9
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The first thing to do is see what the rest pressure is after 10 minutes. You can replace the Accumulator and check valve and this will probably take care of it. 9 out of 10 times this is it. I just hate to tell you to throw something at the problem without knowing 100%.
What happens is the Cold Start system has shut down because of the heat and the fuel head looses the pressure. Since the accumulator or check valve is letting it go. The head then vapor locks if you will and the pumps have a hard time clearing the path to the injectors. When it cools off enough that the cold start system works again the fuel is injected to the intake and the car starts causing the fuel plate to drop and help aid in the fuel pushing past what lock may be present at that time.
What happens is the Cold Start system has shut down because of the heat and the fuel head looses the pressure. Since the accumulator or check valve is letting it go. The head then vapor locks if you will and the pumps have a hard time clearing the path to the injectors. When it cools off enough that the cold start system works again the fuel is injected to the intake and the car starts causing the fuel plate to drop and help aid in the fuel pushing past what lock may be present at that time.
07-03-2007, 05:28 PM
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I had the same issue with my 91. The first thing I did was buy the pressure tester from Tool King for something like $60. I knew I had a residual problem after hooking that up. Then I ordered the check valve from Pelican for $17. That wasn't the problem so I had to plop down $250 or so from Sunset for the accumulator.
Yes, it takes a few days or a week at every step to wait for stuff, but the car doesn't have to stay parked the whole time either, so it's just a little annoying. A shop would probably charge 2-3 hours to fix this on top of full retail for the part, so it's probably a $1000 job to get someone to do it for you.
Yes, it takes a few days or a week at every step to wait for stuff, but the car doesn't have to stay parked the whole time either, so it's just a little annoying. A shop would probably charge 2-3 hours to fix this on top of full retail for the part, so it's probably a $1000 job to get someone to do it for you.
