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Dead Prelude

 
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Old 10-27-2010, 11:04 PM
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Dead Prelude

Hello all. I have had a problem with my 99 honda prelude. This has been a long process of trying to figure out what exactly is wrong with it. For one I wanted to sell it because the parts were getting expensive and it was like one thing after another was going wrong with it. It was throwing the dreaded p1456 code for the purge control solenoid value in the emission system. It was a DENSCO part and I ordered another one but it had 3 line inlets where as the old Densco had two.

POINT being that I was driving my car and hit water going about 35 on my university campus. Now the car made a chuging sound and died. I had it towed back to my house took the distributor cap wires out and the spark plugs and blew hot air in the cylinder holes to try to dry it. The car is cranking but not firing up. So I took it to the shop and the OBD2 ecu was fried out due to water damage according to the mechanic, I verified this as when I hooked up an OBD2 scanner it came up with "error" and didnt read any codes. So I bought the OBD1 from phearable.net and the obd1 jumper harness from ebay so i could get the dang thing running. Also to get ride of the p1456, which is why i mentioned that above. So now the with the OBD1+harness connected, It sounds like it wants to start (its cranking) but it does not seem to be getting spark from the distributor cap.

The mechanical at the shop told me to get a regular OBD2B because the OBD1 is bad. IS this true? Should I just spend more money and buy an OBD2B and see it if fires up? (the shop did not have one OBD2B there to test my vechile). Niether phearable nor the ebay store will accept my items back that was 200 down the drain. What who you do as the next step?
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Old 10-28-2010, 07:27 AM
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Re: Dead Prelude

base or SH?
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Old 10-28-2010, 09:42 AM
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Re: Dead Prelude

Well, Im sure that someone else will be a little more informed on this topic than I, however. Did you change everything needed to convert to OBD1? From My understanding there is a bit to it. Not necessarily just a couple harnesses. The reason the shop was recommending you go back to OBD2 is because from a scan tool stand point. It is far more advanced than OBD1. From a tuner's perspective, OBD1 is superior. I wish I knew more about the OBD systems, but I'm having a hard time wrapping my brain around the OBD computer being fried due to water damage. Have you checked ALL the fuses in the car? Not just ones related by the marking but with a meter, assuring you you have 12v on both sides of EVERY fuse. Very simple to do and may save you time and money. Because I belive there is constant power at the OBD connector. If this is not powering the tool properly it may come on but throw an error. Just some thoughts that come to mind. Im sure some of the conversion geniuses will chime in soon.
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Old 10-28-2010, 09:57 AM
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Re: Dead Prelude

I am running the obd1 from phearable with no problems. I highly doubt that the ecu from phearable is bad, they test every ecu before they send them out. Lemme tell ya, the obd2 vs. OBD1 is a night and day difference. I'd say take it somewhere else that knows hondas better.
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Old 10-28-2010, 10:05 AM
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Re: Dead Prelude

That was another question I forgot to ask. Is your ecu compatible with OBD1?

And Vipers, the problem with the shop isn't necessarily a poor or incompetant shop, they my just not be fluent in the kind of modifications, back dating, tuning the 5th gen guys do with their cars. We see that at our shop, granted I will get put on the job and can usually figure out some kind of solution but when you are used to certain vehicles and what it takes to work on them and someone comes in with a mutt of some sort sometimes you have to just punt. Because from a shops liability stand point as soon as you touh it you're responsible for it. Know what im saying?
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Old 10-28-2010, 11:10 AM
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Re: Dead Prelude

You needed to get a p72 or p8- something. Maybe p28. I forget the other one.

What I don't understand is the water damage. The ecu is on your passenger side floorboard, how the hell did it get water all up in there? When you took it out was the ecu wet at all?

And yes, there is a bit more to the obd conversions than just that. Hell if I know what it is. But I wouldn't quit on the OBD1 setup just yet. As long as you do everything that you need to do, you should be just fine with the OBD1 setup. Come to think of it I think you may need to change some sensors to work with OBD1.



Also the reason I asked if the car is an SH is because the ATTS unit will not work with an OBD1 ecu. ATTS is an OBD2 only thing, and if it is disconnected from the ECU I have heard that it will cut fuel to the engine. So if you have a Type SH car you'll either need to get the OBD2 ecu (P5P) which costs about $750, or you can get a non-SH transmission and possibly engine. If you have a base you don't need to worry about it.
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Old 10-28-2010, 11:18 AM
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Re: Dead Prelude

i agree with viper , they are no very familiar with hondas and there common problems and upgrades ,haven said that , i would check the following ,starer fuel relay under dash should cycle the fuel pump when key is on completely with out starting the engine ,humming should be herd when this action is done , ,if no other problems are present ,other similar trouble could be no signal from crank sensor ,and cam sensor ,witch are located under the timing cover and behind crank pulley ob1 sensor are in the dizzy and ob2 are connect to the oil pump housing.Keep me posted with progress.
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