Acura Legend Forum banner
1 - 17 of 17 Posts

·
Registered
Joined
·
42 Posts
Discussion Starter · #1 ·
My 1990 LS sedan is having hot start problems. The car will not start right after turning it off, unless it cools for 5 or 10 or sometimes 15 minutes...real annoying when I need to run in a store quickly. The car chugs, but wont turn over. If i does turn over, you must feed it gas to keep it running. The car has 198,000 miles, runs almost perfect....the tune-up I just did had no effect on the hot start.

My Honda specialist says its needs a PGM Main Relay, which I have purchased, but havent installed yet.....any suggestions?
 

·
*r**h *eller
Joined
·
1,920 Posts
Sounds more like vapor lock to me. The main relay problem is common but is associated with high interior temperatures.
 

·
Registered
Joined
·
42 Posts
Discussion Starter · #3 ·
Any suggestions on how to go about fixing vapor lock?
Thanks,
Chris
 

·
Registered
Joined
·
45 Posts
Check the main fuel relay. They are notorious on G1's and they are tempurature sensitive.

To test the relay, open the cover for the fuel pump in your trunk. Get the car to do it's problem and with the key in the run position use a test light to see if power is being given to the fuel pump. No power and it's the relay.
 

·
Registered
Joined
·
602 Posts
Hey, I'm having a similar problem. There was a previous post with extensive reply's on it. Can't find the link right now. Basically, when it occurs check the sparkplugs to see if you are getting a spark. If there is no spark It is electrical system. If there is a spark then it is fuel system. If you just want to replace something then try the relays(main for electrical and fuel for fuel problem). I'm still not sure where these relays are located. Also, if it is an electrical problem you can get a multimeter and check the volatage on the ignitor unit. There are four cords leading to it. The black one is ground. See if one of the other three is not hot when the car is in on position. I'm not sure what these three wires tell you- have to check the manual for these but if one is not hot then its probaly the main relay.
BTW. how much did you get the main relay for? Let us know how it went.
 

·
Registered
Joined
·
602 Posts

·
Registered
Joined
·
42 Posts
Discussion Starter · #9 ·
Thanks for all the info/suggestions guys. Hopefully it is the main relay (especially since I already bought a new one) I forget how much I paid for the main relay. I bought it from a local honda specialist who ordered thru the Acura dealership....i think it was around $70.....I will look for the receipt. I have to work all weekend, but hopefully I will find time Monday to replace it. If that doesnt work, then I will turn to the fuel pump/relay possibility.

Any other suggestion would still be appreciated :)

-Chris
 

·
Registered
Joined
·
42 Posts
Discussion Starter · #11 ·
Main Relay Didnt solve problem

I switched the main relay almost 2 months ago, yet the problem continues. It seems that the car's ability to start is entirely based on the temperature of the engine. Once the engine is cool - no problem. If the engine is cool, i can start and turn off the engine over and over with no problem. Problem is, when the temp is in the 80's or higher, it takes forever for the engine to cool without raising the hood. - over an hour sitting today, and still wouldnt start!

So the main relay didnt fix the prob, time to look elsewhere. I have heard some mention of possibly a bad ignitor. Not sure of any further details for that theory.
 

·
Registered
Joined
·
2 Posts
My car had same problem, also A/C works intermittently. I replaced the distributor 2 days ago. A/C works fine, so the starting problem. There was oil leak ( tiny small) into distributor. All it need is a clean up, in process taking apart I broke it.

I talked to a friend of mine. I fixed 3 Legends of same problem, yes as you said it's a ignitor.

Good luck and update the problem.
 

·
Registered
Joined
·
42 Posts
Discussion Starter · #13 ·
So, in you opinion I have a bad ignitor - How expenive is a new ignitor? Easy to replace myself?

Chris
 

·
Registered
Joined
·
1,195 Posts
Ignitor is around $80. I think there was a recall or TSB on the ignitors, thought I read that somewhere on a recall link. I know that there was one for my 1990 Civic. Check with your Acura dealer - they maybe able to check if it was ever replaced under the recall based on the VIN, and if not, may actually do it for free.
 

·
Registered
Joined
·
1 Posts
Hot Start problems

I had a similar hot start problem and first assumed it to be the relay problem that seems so prevelant. It turned out to be a thermal sensor near the water jacket's thermostat. When the engine is started, it has no O2 sensor info (used to set the mixture). This thermal sensor gives a rough setting used only to start the engine. After a short time, the O2 sensor provides feedback to the ECU to set the mixture. This particular themal sensor was removed from the car and tested, appearing fine. Inside, I learned, it's a NTC thermistor, which provides more resistance when colder. I heated it with a heat gun and watched the resistance drop accordingly. I reinstalled it and later, after not finding any problem, I tested it again. This time it looked fine again, but while I continued to hold the heat gun too it (while wondering what the hell to do next) it suddenly jumped to near wide open (above 1 megohm from about 150 ohms). Letting it cool a bit resulted in a normal reading again. Replacing it with a new sensor corrected the problem. Apparently, when the engine was very warm this faulty sensor would register that the engine was EXTREMELY cold. This caused the ECU to attempt to start with a very rich mix.
 
1 - 17 of 17 Posts
Top