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tomsmith
Novice
Dec 12, 2006, 5:50 PM
Post #1 of 12
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need help with 87 accord
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i have a 1987 accord lxi 2.0 and am having some engine troubles. when it's cold, not in gear, and idling, the idle is kinda high, close to 1500-1800rpm. it will idle high for a minute, then it will start to rev up and down. i'm pretty certain that it's the idle air bypass. now just recently the engine started acting up. i stopped to get gas and a couple minutes later the car started running like crap(i've put in fuel system cleaner/drier, and have run a couple tanks of gas through it so i'm counting out bad gas). in gear at a stop the car idles kinda odd. it will run smoothe, then the rpm's will start to drop off for a second and it will run kinda rough, then the rpm's will go back up and the engine idle will smoothe out. when i accelerate from a stop, the engine will bog down like it's getting too much/not enough gas, it will eventually get up to speed and smoothe out. or if i punch it, the passing gear will kick in and it will accelerate without any kind of bogging down. it doesn't do this all the time, btw. and when it does, it only does it when the engine is warm. i've checked for every sign of a head gasket leak and haven't found anything.
also have a vacuum line that has a broken connection, runs from the control box to the pipe that runs from the air filter box to the throttle body.
i've posted this at a couple different forums but haven't gotten any suggestions as of yet, so any help would be greatly appreciated
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steve01832
Veteran
Dec 13, 2006, 2:55 AM
Post #2 of 12
(1737 views)
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Re: need help with 87 accord
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Start with replacing the vacuum hose and make sure the rest are in fairly good condition. I remember Hondas used to have a lot of problems with the cold-start injectors due to a bad thermal time switch. It's been a long time since I've even seen an '87. Another thing to check is to pull the top timing cover off and rotate the engine (clockwise) so that it is at #1 top dead center compression. Make sure the camshaft timing mark on the gear matches perfectly to the mark on the back part of the timing cover. An engine off even 1 tooth on these cars can give you all kinds of performance problems. Good luck and let us know.
Steve
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tomsmith
Novice
Dec 14, 2006, 8:27 PM
Post #3 of 12
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Re: need help with 87 accord
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the nipple the hose attaches to is broken off so i can't just put it back on, and i've tried a couple different adhesives, two part plastic resin stuff, and nothing will hold. anyone have any ideas as to what it might be? it's "U" shaped, runs from the air filter box, on the back side of the engine, up to the throttlebody. i'm pretty sure there is some type of valve inside. it's been like that since before the engine started acting up so i don't think it's related. i wonder if it could just be the engine getting tired. it is going on 300,000 miles. and where would i look to check the codes. was a while ago, but i remember being told it was under the drivers seat. do i have to take the seat off to check it or what? do i wait until the car warms up and the PGM-FI light comes on, kill the engine and check it, or does it not matter?
it's my first "computer" car so i'm not too familiar with how stuff works on em. too much little stuff causing major problems. what ever happened to the good old days of rwd carbed V8's. if it wasn't for the mileage, i trade it back for my 74 plymouth(RIP) in a heartbeat.
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steve01832
Veteran
Dec 15, 2006, 4:15 AM
Post #4 of 12
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Re: need help with 87 accord
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Green wire is ground. Red wire is signal return. Yellow is 5volt reference. These are the wires going to the Throttle Position Sensor mounted on the bottom side of the throttle body. With a voltmeter you want to probe the green and red wires with the key on engine off. You should have either .32 volts or .45 volts depending on what type of system you have in your car. You set this voltage by loosening the 2 screws and moving the TP sensor until the proper voltage is displayed on the meter. Chances are you will have to remove the throttle body to do this so make sure you have a new gasket before you perform this check. This is the factory setting at idle (throttle valve fully closed). Start here and let us know how you make out.
Steve
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 15, 2006, 9:13 AM
Post #5 of 12
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Re: need help with 87 accord
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Just a note about those vacuum fittings:
They break and I have found nothing yet that can glue one back on. Repleacement seems to be the only way unless someone has found some funny self drilling repair kit for those they are a pest, T
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tomsmith
Novice
Dec 15, 2006, 7:26 PM
Post #6 of 12
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Re: need help with 87 accord
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Tom, you wouldnt happen to know what that thing is and what it does do ya? or where i might get a new one? i've looked at what seems like 100's of sites, every time i put in anything regarding the intake or air fliter, all i get back is either the actual intake manifold or the filter itself. and i still have no idea what it is. what would happen if i take that part out, plug those lines and put on one of those cold air intakes? i'm kind of leery about doing that because the vacuum lines run direct to the control box. also you wouldnt happen to have any ideas on what might be wrong with my car would ya? lol
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 16, 2006, 3:19 AM
Post #7 of 12
(1709 views)
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Re: need help with 87 accord
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Hi TomSmith,
Here's the tale of vacuum devices:
There was a day when they just controlled a couple devices in the 50s, 60s and some 70s and just plugging them off didn't stop you and a car might even run better. Those days are gone!!
An engine has a story to tell with vacuum. It can sense the load on it, the air speed its taking in fuel and air an on forever!! In a rush to make cars clean, comfortable, safe, cost less and use almost no fuel, we (a world of engineers) did everything possible to keep the consumer happy.
What happened and needed to is that the vacuum info by the split second gets into computer controls via electrical transfer and the car makes the call to change what is needed to run flawlessly for you.
Each and every vacuum hose fitting are there for a reason. If you have to believe in something trust greed! No car maker would waste a dime on these things if they didn't have to!! If it cost a dollar times a million units it starts to be big bucks!
Each and every one of these has a purpose and should be fixed. If just hose fix the hose. When the plastic towers of vac spuds break which is common they need to be fixed which is pretty much replaced.
When dealing with these I find it best to razor cut the hose and carefully peal the hose away expecting to replace it. You just won't win but pulling on those as they are barbed and not made to take that.
This site changed format a while back and has done nothing but grow and attract techs and guests alike.
Neat site and I bet you get answers here. Merry Christmas, T
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tomsmith
Novice
Dec 18, 2006, 2:54 PM
Post #8 of 12
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Re: need help with 87 accord
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yeah, i know pretty much why they put all that stuff in there. but i asked WHAT THAT PARTICULAR ONE WAS, WHAT IT DID, AND WHERE MIGHT I GET A NEW ONE. prolly woulda saved ya some time if ya just said "i don't know" :-) i'll try my luck elsewhere. thanks
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 18, 2006, 8:07 PM
Post #9 of 12
(1698 views)
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Re: need help with 87 accord
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If you can complain at free tech advice you must be one of those customers who ends up with your headlights pointing right up your a$$ and deserve it! T
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steve01832
Veteran
Dec 19, 2006, 3:55 AM
Post #10 of 12
(1693 views)
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Re: need help with 87 accord
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Hey Tom. Earlier in this string of posts I gave you the color codes and their values for the TPS. I called in a favor at Honda and this is the most common problem for a hunting idle on these cars. If the TPS doesn't fix it, more than likely the throttle body is at fault. Did you perform this test or did you think I was lying to you? If you couldn't be bothered with doing as you were advised to do that's not our problem here at Carjunky. It's up to you to follow through. Don't go off on Tom, he was only trying to help you out. I gave you a FACTORY PROCEDURE straight out of a Honda repair manual. You didn't do the test. That's your own fault.
Steve
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tomsmith
Novice
Dec 22, 2006, 3:29 PM
Post #11 of 12
(1676 views)
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Re: need help with 87 accord
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sorry if i came across as an a**hole, but i have been trying to figure out what is wrong with this car for a while now and haven't had any luck and i'm getting a tad bit frustrated. and yes i know you guys are trying to help, and i thank you for it, but in toms post about the vacuum system didn't answer my question(and as an aside, i did finally figure out what that particular part i was asking about was after several more hours of searching the web). and yes, i did perfom that test on the TPS a couple days ago, and it tested within range, if a bit on the lower side of the scale. i'm probably going to replace it, along with the idle air bypass and the air flow tube, and for the hell of it the fuel filter.
happy holidays
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 23, 2006, 12:00 AM
Post #12 of 12
(1674 views)
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Re: need help with 87 accord
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Peace and we all prevail, T
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