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#1
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Dodge Caravan 93 3.0l Engine whistles at idle
When the engine is cold it is OK but at normal temperature if I let the
engine idle it starts giving a loud whistle. If I rev it high it goes away. The idle RPM is between 750-800. I am pretty sure it does not come from the belts or pulleys. Any ideas what could be the problem ? TIA Paul |
#2
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Could be a vacuum leak, listen under the hood at idle.
Glenn Beasley Chrysler Tech "Paul Singh" > wrote in message news:4b5Ud.48922$uc.30511@trnddc03... > When the engine is cold it is OK but at normal temperature if I let the > engine idle it starts giving a loud whistle. If I rev it high it goes away. > The idle RPM is between 750-800. I am pretty sure it does not come from the > belts or pulleys. Any ideas what could be the problem ? > > TIA > Paul > > |
#3
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Thanks for the reply.
While the engine is running I have tried to unplug and plug the vacuum pipes back. The darn thing does not seem to make any difference. I just can;t seem to locate the source. I will keep trying. -Paul "maxpower" > wrote in message ... > Could be a vacuum leak, listen under the hood at idle. > > Glenn Beasley > Chrysler Tech > "Paul Singh" > wrote in message > news:4b5Ud.48922$uc.30511@trnddc03... >> When the engine is cold it is OK but at normal temperature if I let the >> engine idle it starts giving a loud whistle. If I rev it high it goes > away. >> The idle RPM is between 750-800. I am pretty sure it does not come from > the >> belts or pulleys. Any ideas what could be the problem ? >> >> TIA >> Paul >> >> > > |
#4
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Check the PCV valve by temporarily removing/bypassing it. Some
aftermarket valves will whistle like a train. |
#5
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I replaced the PCV valve with another chrysler made but not a new one. The
bloddy whistle is still there. -Paul "Steve" > wrote in message oups.com... > Check the PCV valve by temporarily removing/bypassing it. Some > aftermarket valves will whistle like a train. > |
#6
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"Paul Singh" > wrote in message news:Eo8Ud.31500$uc.27265@trnddc01... > Thanks for the reply. > While the engine is running I have tried to unplug and plug the vacuum pipes > back. The darn thing does not seem to make any difference. I just can;t seem > to locate the source. I will keep trying. > > -Paul > > "maxpower" > wrote in message > ... > > Could be a vacuum leak, listen under the hood at idle. > > > > Glenn Beasley > > Chrysler Tech > > "Paul Singh" > wrote in message > > news:4b5Ud.48922$uc.30511@trnddc03... > >> When the engine is cold it is OK but at normal temperature if I let the > >> engine idle it starts giving a loud whistle. If I rev it high it goes > > away. > >> The idle RPM is between 750-800. I am pretty sure it does not come from > > the > >> belts or pulleys. Any ideas what could be the problem ? > >> > >> TIA > >> Paul > >> > >> > > > > it could be a broken intake gasket, if it is a vacuum leak, take a runner hose to your ear and use it as a stethoscope to locate the leak, or at lease eliminate that possibility > |
#7
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"maxpower" > wrote in message ... > it could be a broken intake gasket, if it is a vacuum leak, take a runner > hose to your ear and use it as a stethoscope to locate the leak, or at > lease > eliminate that possibility >> > > In between I have cleaned the throttle body, air plennum and fuel injectors( new O rings). All the gaskets were replaced with the new and the bolts were tightened to the FRM specified torques. Lot of black stuff I removed. The whistle was there before and still is. I cleaned the intake area because I have never cleaned it in over 12 years. So I suspect that is not the cause. Last night I looked at it again but nothing positive to report about. I think it may help if I explain the symptoms a little more. a) The whistle only comes when the Engine is at operating temps. b) If I come home and sit there for couple of minutes without turning the engine off, no whistle. c) If I let it idle for few more minutes, whistle yes. If I rev it, it goes away. Let it idle, it will come back. d) Driving normally, no whistle. e) While idling if the radiator fan comes on, whistle goes away. It comes back as soon as the fan stops. f) I removed the PCV valve suction pipe and put my finger on the PCV valve to seal the suction. Nope it didn;t help. I can remove the PCV valve completely and then see if the whistle goes away. Lately I also replaced the thermostat because of the engine code. The thermostat I bought is not made by chrysler but got it from Schucks which I think is made by prestone. Come to think of it, the whistle was there prior to replacing the thermostat. I tried to locate the vacuum leak. No luck yet. While the engine is running I tried removing one vacuum pipe at a time to see if that makes any difference. No luck. Well, I haven't tried all of them yet. The fan belts seem to have proper tension, auto tensioner is free to move and has good tension to keep the belt tight. The compressor belt has enough tension. I have tried different levels of tension on the compressor belt. I would suspect the pulleys if the whistle is there all the time. If I start the engine cold, no whistle. It starts suddenly when the temp is about to reach the operating level. Can it be ignition timing related at all ? Bloody hell, I can't even pin point where the whistle is coming from. I asked my wife to help me locate the area it may be coming from. She seems to think it is from the left side of the engine i.e. the surpentine belt area. It is getting to be a challenge now. I will try your runner hose method and will report. -Paul |
#8
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"Paul Singh" > wrote in message news:u7zUd.43418$EL5.35643@trnddc05... > > "maxpower" > wrote in message > ... > > it could be a broken intake gasket, if it is a vacuum leak, take a runner > > hose to your ear and use it as a stethoscope to locate the leak, or at > > lease > > eliminate that possibility > >> > > > > > In between I have cleaned the throttle body, air plennum and fuel > injectors( new O rings). All the gaskets were > replaced with the new and the bolts were tightened to the FRM specified > torques. Lot of black stuff I removed. The whistle was there before and > still is. I cleaned the intake area because I have never cleaned it in over > 12 years. So I suspect that is not the cause. Last night I looked at it > again but nothing positive to report about. I think it may help if I explain > the symptoms a little more. > > a) The whistle only comes when the Engine is at operating temps. > b) If I come home and sit there for couple of minutes without turning the > engine off, no whistle. > c) If I let it idle for few more minutes, whistle yes. If I rev it, it goes > away. Let it idle, it will come back. > d) Driving normally, no whistle. > e) While idling if the radiator fan comes on, whistle goes away. It comes > back as soon as the fan stops. > f) I removed the PCV valve suction pipe and put my finger on the PCV valve > to seal the suction. Nope it didn;t help. I can remove the PCV valve > completely and then see if the whistle goes away. > > Lately I also replaced the thermostat because of the engine code. The > thermostat I bought is not made by chrysler but got it from Schucks which I > think is made by prestone. Come to think of it, the whistle was there prior > to replacing the thermostat. > > I tried to locate the vacuum leak. No luck yet. While the engine is running > I tried removing one vacuum pipe at a time to see if that makes any > difference. No luck. Well, I haven't tried all of them yet. > > The fan belts seem to have proper tension, auto tensioner is free to move > and has good tension to keep the belt tight. The compressor belt has enough > tension. I have tried different levels of tension on the compressor belt. I > would suspect the pulleys if the whistle is there all the time. If I start > the engine cold, no whistle. It starts suddenly when the temp is about to > reach the operating level. > > Can it be ignition timing related at all ? > > Bloody hell, I can't even pin point where the whistle is coming from. I > asked my wife to help me locate the area it may be coming from. She seems to > think it is from the left side of the engine i.e. the surpentine belt area. > It is getting to be a challenge now. > > I will try your runner hose method and will report. > > -Paul > > Sounds like it changes when the load changes (vacuum) I would suspect a piece of old gasket left when reassembled. but without hearing it, it is hard to tell. get out that heater hose and use it as a stethoscope and you will pin point the noise |
#9
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Paul Singh wrote:
> "maxpower" > wrote in message > ... > >>it could be a broken intake gasket, if it is a vacuum leak, take a runner >>hose to your ear and use it as a stethoscope to locate the leak, or at >>lease >>eliminate that possibility >> >> > In between I have cleaned the throttle body, air plennum and fuel > injectors( new O rings). All the gaskets were > replaced with the new and the bolts were tightened to the FRM specified > torques. Lot of black stuff I removed. The whistle was there before and > still is. I cleaned the intake area because I have never cleaned it in over > 12 years. So I suspect that is not the cause. Last night I looked at it > again but nothing positive to report about. I think it may help if I explain > the symptoms a little more. > > a) The whistle only comes when the Engine is at operating temps. > b) If I come home and sit there for couple of minutes without turning the > engine off, no whistle. > c) If I let it idle for few more minutes, whistle yes. If I rev it, it goes > away. Let it idle, it will come back. > d) Driving normally, no whistle. > e) While idling if the radiator fan comes on, whistle goes away. It comes > back as soon as the fan stops. > f) I removed the PCV valve suction pipe and put my finger on the PCV valve > to seal the suction. Nope it didn;t help. I can remove the PCV valve > completely and then see if the whistle goes away. > > Lately I also replaced the thermostat because of the engine code. The > thermostat I bought is not made by chrysler but got it from Schucks which I > think is made by prestone. Come to think of it, the whistle was there prior > to replacing the thermostat. > > I tried to locate the vacuum leak. No luck yet. While the engine is running > I tried removing one vacuum pipe at a time to see if that makes any > difference. No luck. Well, I haven't tried all of them yet. > > The fan belts seem to have proper tension, auto tensioner is free to move > and has good tension to keep the belt tight. The compressor belt has enough > tension. I have tried different levels of tension on the compressor belt. I > would suspect the pulleys if the whistle is there all the time. If I start > the engine cold, no whistle. It starts suddenly when the temp is about to > reach the operating level. > > Can it be ignition timing related at all ? > > Bloody hell, I can't even pin point where the whistle is coming from. I > asked my wife to help me locate the area it may be coming from. She seems to > think it is from the left side of the engine i.e. the surpentine belt area. > It is getting to be a challenge now. > > I will try your runner hose method and will report. > > -Paul The noise coming on just as it reaches operating temp, and the fans being on or not affecting it - what shape is the coolant pressure cap in (i.e., does it need replacing?)? Also, the fans coming on could simply be changing engine operation enough to cause the noise to stop by loading the alternator. Bill Putney (To reply by e-mail, replace the last letter of the alphabet in my adddress with the letter 'x') |
#10
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"Paul Singh" > wrote in message news:u7zUd.43418$EL5.35643@trnddc05... > > "maxpower" > wrote in message > ... >> it could be a broken intake gasket, if it is a vacuum leak, take a runner >> hose to your ear and use it as a stethoscope to locate the leak, or at >> lease >> eliminate that possibility >>> >> >> > In between I have cleaned the throttle body, air plennum and fuel > injectors( new O rings). All the gaskets were > replaced with the new and the bolts were tightened to the FRM specified > torques. Lot of black stuff I removed. The whistle was there before and > still is. I cleaned the intake area because I have never cleaned it in > over 12 years. So I suspect that is not the cause. Last night I looked at > it again but nothing positive to report about. I think it may help if I > explain the symptoms a little more. > > a) The whistle only comes when the Engine is at operating temps. > b) If I come home and sit there for couple of minutes without turning the > engine off, no whistle. > c) If I let it idle for few more minutes, whistle yes. If I rev it, it > goes away. Let it idle, it will come back. > d) Driving normally, no whistle. > e) While idling if the radiator fan comes on, whistle goes away. It comes > back as soon as the fan stops. > f) I removed the PCV valve suction pipe and put my finger on the PCV valve > to seal the suction. Nope it didn;t help. I can remove the PCV valve > completely and then see if the whistle goes away. > > Lately I also replaced the thermostat because of the engine code. The > thermostat I bought is not made by chrysler but got it from Schucks which > I think is made by prestone. Come to think of it, the whistle was there > prior to replacing the thermostat. > > I tried to locate the vacuum leak. No luck yet. While the engine is > running I tried removing one vacuum pipe at a time to see if that makes > any difference. No luck. Well, I haven't tried all of them yet. > > The fan belts seem to have proper tension, auto tensioner is free to move > and has good tension to keep the belt tight. The compressor belt has > enough tension. I have tried different levels of tension on the compressor > belt. I would suspect the pulleys if the whistle is there all the time. If > I start the engine cold, no whistle. It starts suddenly when the temp is > about to reach the operating level. > > Can it be ignition timing related at all ? > > Bloody hell, I can't even pin point where the whistle is coming from. I > asked my wife to help me locate the area it may be coming from. She seems > to think it is from the left side of the engine i.e. the surpentine belt > area. It is getting to be a challenge now. > > I will try your runner hose method and will report. > > -Paul This sounds so familiar I could cry.. It is coming from the seal in the water pump. And don't ask me how long it took me to find it the first time I ran into it. <G> I've ran into this whistle noise exactly as you have described it two times and the pump has fixed it both times. Denny |
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