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  #1  
Old 05-12-2011, 11:54 AM
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1995 Honda Accord
 
Join Date: May 2011
Location: Dallas, TX
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Megatonrefugee
Default Whining noise on cold start up

When the car has been sitting over night, it cranks a couple times and starts up, not right away like it normally does after it has warmed up.

After the cold start up there is a whine sound the increases with rpm. Sounds like a mini supercharger. Car runs a little rough at this time too.

Usually throws a CEL the two that are logged are my code 9 and 22.

I have replaced

-my entire distributor
-Rotor and cap
-Fuel filter
-Pcv valve
-Coolant fan temp sensor
-Engine temp sender
-Spark plugs
-Air filter
-ignition timing set to spec.
-Fuel system cleaner.
-Also run techron supplemented fuel at every fill up.

What could this noise be? why does it throw the CEL? Why is it only at cold start ups?
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  #2  
Old 05-12-2011, 12:05 PM
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Code 9 is CYP sensor error and can mean faulty sensor in distributor. Since you've replaced the distributor, you need to check the resistance at the distributor first, then reconnect and check at ECU harness connector (under passengers foot area). Resistance should be 700-1000 ohms (no sure of spec). If you get zero or infinite, then something is wrong. If all checks out well, then ECU may have a fault.

I had to replace ECU in my 94EX to fix a persistent code 9. Above check confirmed that sensor was fine. I also had replaced distributor.

Code 22 is VTEC pressure solenoid circuit fault. It could be a faulty solenoid or faulty wiring/connector. Check solenoid first. If you find open/short circuit, the solenoid winding is bad. Replace solenoid valve assembly. A used part will be your low cost option. Check car-part.com and ebay.

good luck
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  #3  
Old 05-12-2011, 12:43 PM
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Megatonrefugee
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Which connector do I check at the ecu? I have a Haynes manual and it only give where to check at the distributor
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Old 05-12-2011, 06:54 PM
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Download the 94-97 Accord Manual from Online Manuals links in DIY forum.

Manual will show the connectors. There are three connectors to ECU and the middle one (B) is one to be disconnected. The Orn2 (pin11) and Wht (Pin12) are wires to be checked (same wires as at distributor). This information is found in the Fuel and Emissions section.

good luck
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  #5  
Old 05-12-2011, 08:06 PM
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just to be certain im doing this right..

Click the image to open in full size.

i tested all 3 pairs of pins all tested between 700-1200 ohm

one thing it asks me to test for is continuity when tested to ground.

i just put positive tester to each pin and had the negitive tester to battery ground. i assume you dont want a reading?

i also tested the vtec switch and read 16ohm so does that mean its bad?
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Old 05-12-2011, 09:19 PM
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When you check continuity to ground, you want it to read open-circuit (just like when you don't touch the probes to anything).
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Old 05-12-2011, 09:23 PM
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The two pins of interest are 4 & 8, on the lower side of the picture. Since you measured a good resistance, they are fine as would be expected w/ a new distributor.

Resistance is measured pin-pin, not pin to ground. Pin to ground checks would be appropriate if you find a very low resistance perhaps indicating a wiring or connector fault.

Next, disconnect at the ECU and test same two wires on B connector as described above. If you get very similar resistance, then ECU is likely failed. If resistance is open or shorted, then a wiring or connector fault exists beyond the connector you imaged.

My 94 Accord Manual shows code 22 as Vtec pressure switch, not solenoid. So the info I gave you earlier (from googling at office) must be wrong. You need to go through diagnostics for Code 22, however you probably need to replace the pressure switch, not the solenoid valve.

good luck
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Last edited by TexasHonda; 05-13-2011 at 06:51 AM.
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Old 05-13-2011, 03:15 PM
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Megatonrefugee
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I forgot to add that the whining noise comes from the transmission side of the engine and goes away when the car warms up.
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  #9  
Old 05-13-2011, 03:52 PM
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Okay I want to make sure I'm doing this right. I checked the two pins on the bottom right 11 and 12 the furthest one to the right being pin 9

08-07-06-05-04-03-02-01
16-15-14-13-12-11-10-09

It came back with 9ohm

Am I testing it right?

Click the image to open in full size.
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  #10  
Old 05-13-2011, 04:30 PM
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What year accord is this? Put the info in your signature so we can quickly see what you drive.
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Old 05-13-2011, 04:30 PM
 
 
 
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1994, accord, cold, connector, cyp, developes, engine, honda, noise, solenoid, start, starting, valve, warms, whining


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