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Hello to all. I have a 1990 245 with 88K miles. The car wont start unless you depress the gas pedal slowly while cranking. Mods include Bilstein, Turbo sway bars and virgo rims with Dunlop Da2 tires. Any ideas would be appreciated. Ty Dave.
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The info about cleaning the throttle body is good essential 240 stuff. With a dirty throttle, the switch may not make contact and the engine may not idle properly. If you're starting up from cold, it needs a strong idle or some throttle applied in order to get some air to run.
Another item that can help it start sooner is a fuel pump check valve. This is a little device that's screwed into the outlet end of your fuel pump. The idea is it keeps the fuel line full right up to the injectors so the engine's ready to run as soon as it gets ignition pulses.
Also, check your crank position sensor. If the cable is coming apart and losing insulation, it's time for a new one. A bad one can cause an intermittent no-start in 89+ cars. I don't think that's your problem here, but it's something that left unattended will leave you stuck on the side of the road sometime.
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::: Rob Bareiss, New London CT ::: 92 244 ::: 90 745GL ::: 90 745T ::: 84 242DL ::: 90 745T Parts ::: Used to have : 86 244DL, 87 244DL, 91 244, 88 244GL, 88 744GLE, 82 245T, 86 244DL, 87 244DL, 88 245DL, 89 244DL!
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"Another item that can help it start sooner is a fuel pump check valve. This is a little device that's screwed into the outlet end of your fuel pump. The idea is it keeps the fuel line full right up to the injectors so the engine's ready to run as soon as it gets ignition pulses."
I think that depends, Rob. My understanding is that the check valve is meant to aid warm/hot restarts—by keeping pressure up for a short time to prevent vapor lock in the fuel rail from engine heat. This is consistant with the test for "residual" pressure, which is measured only 20 minutes after shut down.
Do you think Dave's problem might be due to an overrich condition? The fact that he has to "depress.. the pedal" (admitting extra air), made me think maybe he's compensating for extra fuel in the mix.
Could the Fuel Pressure Regulator diaphragm develop a "slight" leak (into the vacuum hose? Or do they always dump massive a amount of fuel when they go bad? (I never saw a bad one -- lucky me.)
Or might the ECT sensor have drifted out of range, giving the ECU false temperature info?
If you see this, Dave, let us know if the problem is the same whether starting cold, warm, or hot.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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You are, as usual, correct on all counts. The main function of that check valve is to help prevent vapor lock, and keep liquid in the pump for the next start.
There certainly could be something like a bad vacuum hose to the fuel pressure regulator making it over rich.
I think I'd start with the throttle body, and move on to the other suggestions from there. The throttle gasket is less than $1, and a can of carb cleaner spray should take care of it. After that if problems persist, the other items can be addressed one by one.
You know the throttle is filthy. They all are!
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::: Rob Bareiss, New London CT ::: 92 244 ::: 90 745GL ::: 90 745T ::: 84 242DL ::: 90 745T Parts ::: Used to have : 86 244DL, 87 244DL, 91 244, 88 244GL, 88 744GLE, 82 245T, 86 244DL, 87 244DL, 88 245DL, 89 244DL!
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Throttle body clean, throttle position sensor adjust, idle air control valve clean, does it idle and run well afterwards? If not check the AMM...
Greg Mustang
Montreal - Canada
www.volvoclassic.bravehost.com
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Greg Mustang - www.volvoclassic.bravehost.com
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When was the last time you cleaned the throttle body?
Randy
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Thank you for all the support. It is great to have people out there to help. I have never cleaned the throttle body. Yesterday the car died when I slowed down for a red lite but restarted. The start problem is all of the time. I spoke to an old retired Volvo mechanic who also said to check the O2 sensor( which I have never changed and see if the tip is missing). If not he thought it might be the AMM. The start problem is hit or miss hot or cold. Thanks again to all. Dave.
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Intermittent no-starts can indicate crank sensor or, less often, fuel pump relay. The fuel pump relay usually quits and stays that way, you just won't get going one day.
Both together probably account for 90% of the tow-ins I saw at the shop.
Replace both parts just because they're cheaper than towing the car one time.
The fuel relay has a date code on it... if it's more than about 6 yrs old, they become troublesome. Many posts here dealing with re-soldering them internally. I'd replace it, and resolder the old one as a spare.
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::: Rob Bareiss, New London CT ::: 92 244 ::: 90 745GL ::: 90 745T ::: 84 242DL ::: 90 745T Parts ::: Used to have : 86 244DL, 87 244DL, 91 244, 88 244GL, 88 744GLE, 82 245T, 86 244DL, 87 244DL, 88 245DL, 89 244DL!
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