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New to the world of Prelude...HELP please! :)

 
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Old 03-25-2014, 07:20 PM
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New to the world of Prelude...HELP please! :)

Hello!

I recently purchased a 1992 Honda Prelude on a whim and I'm running into problems. Being used to older, domestic vehicles this is a whole new world for me that I'm interested in exploring.

The Prelude I bought has had an engine swap, a buddy told me it was switched from an F22 to an H22, not too familiar what that means but i know its a V-Tech that's in it now.

Now the issues I'm having...
The V-Tech computer isn't hooked up, i was told its just 1 wire but I'm not sure how to go about hooking it up...
The temp gauge isn't working at all, it is lit up but it stays constantly at the notch above Low...
It started leaking coolant at a decently bad rate. I noticed it happened in a short time period after using the heat in it.
Also, i cannot find the diagnostic plug at all!!

Any help anyone can give would be great. We fell in love with this car when we got it and I don't want it to sit...
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Old 03-25-2014, 08:02 PM
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Re: New to the world of Prelude...HELP please! :)

All Gen. Prelude Service Manuals
^^ this should help...

Welcome to the world of Honda engineering, where all the laid off Ford engineers ended up, along with their stupid ideas. Just kidding, but the Honda cars can be daunting or adventerous depending on your perspective.
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Old 03-25-2014, 08:06 PM
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Re: New to the world of Prelude...HELP please! :)

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Originally Posted by zshrout View Post
The Prelude I bought has had an engine swap, a buddy told me it was switched from an F22 to an H22, not too familiar what that means but i know its a V-Tech that's in it now.
er...that's VTEC -- Variable Valve Timing and Electronic Lift Control

The F22A1 was the single-cam engine in the base-model Prelude S for that year. You'll also sometimes see reference to an F22B, which is a Japanese-market twin-cam engine used in many Japanese Preludes.

The H22A is the twin-cam VTEC engine...more power. Quite a few engine swaps use used Japanese engines...that's something you'll need to determine. Nothing wrong with it, but may help with your issues below. Look below and in front of the distributor, you'll see the engine number is stamped on the block...if it says "H22A", then you have a Japanese-market engine. If it says "H22A1", you have a North American-market engine.

Quote:
Now the issues I'm having...
The V-Tech computer isn't hooked up, i was told its just 1 wire but I'm not sure how to go about hooking it up...
The temp gauge isn't working at all, it is lit up but it stays constantly at the notch above Low...
It started leaking coolant at a decently bad rate. I noticed it happened in a short time period after using the heat in it.
Also, i cannot find the diagnostic plug at all!!
1. Are you sure your buddy swapped the ECU? You need the right ECU to go with the engine; find out if he did or didn't, and let us all know.
2. Check the thermostat -- if it's frozen open, the engine could be running cool, and the temperature gauge may be working fine.
3. Leaking coolant from where? Could be anything from a pinhole in a hose to a cracked radiator head to a dying water pump. If it started only after you used the heater, I'd look at the heater hose connections at the firewall -- just about dead in the middle of the firewall, behind the intake manifold, where they're hard to reach. :)
3A. When was the timing belt last changed? On that car, it should be every 90k miles or seven years. You DO NOT, DO NOT, DO NOT want the timing belt to break...if there's any doubt, replace it and the balancer shaft belt. Replace the water pump at the same time -- it's easiest to get at then.
4. If you have a Japanese engine (this and the ECU are why I asked), there won't be any diagnostics to check. Regardless, '92s were OBD I cars -- the universal diagnostic plugs didn't appear until the switch to OBD II around 1994. To check fault codes, you have to jump a pigtail wire behind the heater core and read the blinks. Find the sticky with links to the factory shop manuals and download the 4th gen shop manual -- that will tell you in detail how to do this.

Enjoy!
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Old 03-25-2014, 08:13 PM
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Re: New to the world of Prelude...HELP please! :)

Thank you i will check what you said as soon as I'm near it. And it has the VTEC ecu he said it was just one wire to the solenoid that needed run. its leaking coolant from behind the engine. and i will change the timing belt and all you recommended at once if not sooner.
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Old 03-25-2014, 10:40 PM
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Re: New to the world of Prelude...HELP please! :)

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Originally Posted by zshrout View Post
Thank you i will check what you said as soon as I'm near it. And it has the VTEC ecu he said it was just one wire to the solenoid that needed run. its leaking coolant from behind the engine. and i will change the timing belt and all you recommended at once if not sooner.
1992-1993 models didn't come prewired for VTEC from the factory, so yeah you'll have to run 1 or 2 wires from that solenoid in the engine bay, to the ECU inside the car down in the passenger footwell. There's a few write-ups out there on exactly where to hook things up, just do a quick google search.

For the temp gauge, there's a single prong connector that plugs into the sending unit on the passenger side of the head, down below the distributor. Check to make sure that's connected. Sending units seem to go bad on these things from time to time, I know I've had my fair share of temp gauge issues.
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Old 03-26-2014, 12:11 PM
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Re: New to the world of Prelude...HELP please! :)

Well I got part of the leak fixed. I opened the hood when coolant was pouring out and it was coming from around the egr valve. I replaced that (at 11:30 at night in the o'reillys parking lot!) It has slowed down substantially but still drips at a steady pace. When I got it home it had stopped but I dont know it it was running abnormally hot or not because of the temp gauge. Going to work on it today I will post results if its the sending unit wire.
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Old 03-26-2014, 12:48 PM
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Re: New to the world of Prelude...HELP please! :)

Welcome to the Prelude family. Looks like you're starting to get things under control. So far you've been getting all the correct guidance. Hopefully your temperature sensor is working properly. Do your fans come on at all? As for the diagnostic plug. There's no diagnostic plug on OBD1 preludes. That came in the 96-up preludes. You'll have to check the engine codes with a looped wire on the plug behind & just under the rear of the radio.
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Old 03-27-2014, 05:20 PM
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Re: New to the world of Prelude...HELP please! :)

well everything WAS going well but now it wont start!! starting to see issues this guy left behind. on a good note i found the coolant leak.
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Old 04-30-2014, 09:55 PM
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Re: New to the world of Prelude...HELP please! :)

Hey guys,I have a 97 prelude,and my ignition cylinder is bad and no one makes them anymore will a 97 civics work for me?
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Old 09-07-2014, 09:56 PM
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Re: New to the world of Prelude...HELP please! :)

Okay update time...

Ive learned a bit more since I was here last, alot of which was learned through experience......
So the coolant was the Fast Idle Valve leaking, this also fixed the weird up and down idle.
The temp guage wasnt hooked up and the thermostat was stuck open as well. Also it needed a head gasket so after paying way more than i should have it is up and running. Now i just need to fix a power steering leak, rear wheel bearings, shocks, something in the ABS called a "Modulator Solenoid Valve" on the front driver side.
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