Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

No start when hot. Starts good cold, drives great.

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Old 08-06-2011, 09:34 AM
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Default No start when hot. Starts good cold, drives great.

92 civic with B18c GT35r turbo.

Update (8/11): Starts great when cool (130F range and below), drives good for the most part (details below) but when the car is shut down it will not restart, only cranks strong, until the engine cools down again. Sounds like a main relay, its not.

I have fuel and spark.

If the coolant temp sensor is unplugged, the engine will restart without having to wait for the engine to cool. In addition, the car will also start if the TPS is unplugged (with the CTS still plugged in)

This may be a seperate problem but I want to add it in case it is reivant to this issue. When attempting to make a pull, my car will often times cut out around 5500 rpm and just bounce the RPMs like the engine is sitting on my 2 step, while other times I can make a full pull to redline. Other times the car will simply fall flat on its face near 4500 RPM and if you try to step on the car more, the throttle is unresponsive until RPMs drop a few hundred. Anything below 4000 RPM and i really have no issues.

Any ideas?

Thanks in advance. Doug.

Last edited by EG6 Love; 08-11-2011 at 07:06 PM.
Old 08-06-2011, 09:40 AM
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Default Re: No start when hot. Starts good cold, drives great.

Resolder the main relay.
Old 08-06-2011, 10:53 AM
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Default Re: No start when hot. Starts good cold, drives great.

had similar problem on an old crx....
replaced the main relay .....

fixed the problem.

$40 part....
and that was after a $500 trip to honda for them to replace my distributor (and not fix the problem)

thank god for honda-tech
Old 08-06-2011, 04:18 PM
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Default Re: No start when hot. Starts good cold, drives great.

I thought that the engine wouldn't crank when it was a main relay?
Old 08-06-2011, 04:49 PM
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Default Re: No start when hot. Starts good cold, drives great.

Originally Posted by EG6 Love
I thought that the engine wouldn't crank when it was a main relay?
The main relay has nothing to do with the starter or starter circuit.
Old 08-07-2011, 11:50 AM
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Default Re: No start when hot. Starts good cold, drives great.

I took apart the main relay and checked for the cracked solders and they were fine. the relay clicks three times during the different ignition cycles.

any other ideas?
Old 08-07-2011, 12:02 PM
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Default Re: No start when hot. Starts good cold, drives great.

I wouldn't trust a visual inspection. I would just go ahead and resolder it.
Old 08-07-2011, 12:56 PM
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Default Re: No start when hot. Starts good cold, drives great.

Originally Posted by grumblemarc
I wouldn't trust a visual inspection. I would just go ahead and resolder it.
This^
Old 08-07-2011, 01:58 PM
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Default Re: No start when hot. Starts good cold, drives great.

Main relays are known to cause starting problems when the car is hot and alot of people take their relays everywhere they go so it can stay cool (if they're lazy)
Old 08-08-2011, 02:46 PM
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Default Re: No start when hot. Starts good cold, drives great.

Resoldered. Still have the same issue.
Old 08-08-2011, 04:05 PM
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Default Re: No start when hot. Starts good cold, drives great.

Are you testing for voltage at the injector clips with the key in ON(II)? Do the IACV and O2 sensor clips get battery voltage?
Old 08-08-2011, 05:49 PM
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Default Re: No start when hot. Starts good cold, drives great.

I am testing at injector clips in the on position. I have not checked voltage at or the o2 but I don't have a c.e.l. But I will check and post my results.
Old 08-08-2011, 05:52 PM
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Default Re: No start when hot. Starts good cold, drives great.

hey quick question i have a b20b boosted and it just start bogging out when i would hit boost then when i shut car off it didnt want to start unless i give it gas??? any thoughts
Old 08-08-2011, 05:58 PM
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Default Re: No start when hot. Starts good cold, drives great.

Originally Posted by ej1b20b pshht
hey quick question i have a b20b boosted and it just start bogging out when i would hit boost then when i shut car off it didnt want to start unless i give it gas??? any thoughts
Please don't thread jack. Make your own thread.
Old 08-08-2011, 05:59 PM
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Default Re: No start when hot. Starts good cold, drives great.

i cant yet sorry just asking a question
Old 08-08-2011, 06:20 PM
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Default Re: No start when hot. Starts good cold, drives great.

Originally Posted by ej1b20b pshht
i cant yet sorry just asking a question
Trial Users may create tech threads. Give it a shot.

Last edited by Former User; 08-10-2011 at 07:23 PM.
Old 08-10-2011, 06:39 PM
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Default Re: No start when hot. Starts good cold, drives great.

When the coolant temp sensor is unplugged the car will start, plug it back in and I have a cranking no start again.

Last edited by EG6 Love; 08-11-2011 at 06:57 PM.
Old 08-11-2011, 06:47 PM
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Default Re: No start when hot. Starts good cold, drives great.

Originally Posted by EG6 Love
When the coolant temp sensor is unplugged the car will start, plug it back in and I have a cranking no start again.

So heres what i figured out, I checked voltage at the coolant temp sensor with the connector unplugged and only had .5V coming FROM the ecu. Back tracked to the pin on the ecu and there is only .5V coming from there.

Wouldn't by the time the signal got back to the ECU it would be a reading of 300+ degrees, right? Unplugging the sensor will cause my afr to go from 14 to 10 at idle.

Whats wrong with the ECU?
nevermind... wrong thread
Old 03-11-2024, 07:51 PM
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Default Re: No start when hot. Starts good cold, drives great.

Originally Posted by EG6 Love
92 civic with B18c GT35r turbo.

Update (8/11): Starts great when cool (130F range and below), drives good for the most part (details below) but when the car is shut down it will not restart, only cranks strong, until the engine cools down again. Sounds like a main relay, its not.

I have fuel and spark.

If the coolant temp sensor is unplugged, the engine will restart without having to wait for the engine to cool. In addition, the car will also start if the TPS is unplugged (with the CTS still plugged in)

This may be a seperate problem but I want to add it in case it is reivant to this issue. When attempting to make a pull, my car will often times cut out around 5500 rpm and just bounce the RPMs like the engine is sitting on my 2 step, while other times I can make a full pull to redline. Other times the car will simply fall flat on its face near 4500 RPM and if you try to step on the car more, the throttle is unresponsive until RPMs drop a few hundred. Anything below 4000 RPM and i really have no issues.

Any ideas?

Thanks in advance. Doug.
Old 03-11-2024, 07:55 PM
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Default Re: No start when hot. Starts good cold, drives great.

Hi. i had similar issue....engine will cut when hot, and will not start until cooled down. my problem was the distributer, and had to replace it. try to test it, when the engine cuts out or will not start by rapping a cloth around the distributer and wetting it for a minute or two, if it start immediately, replace the distributer
Old 03-13-2024, 02:33 AM
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Default Re: No start when hot. Starts good cold, drives great.

Originally Posted by EG6 Love
When the coolant temp sensor is unplugged the car will start, plug it back in and I have a cranking no start again.
Test the ECT sensor its very common to fail and give these symptom's.

If you have Hondata, plug in the ecu while the engine is cold and off and see what the sensor temp is reading. If the sensor shows a value that is incorrect there is the issue.\

The ICM inside the distributor will give the same symptoms as well so it could also be the ICM, I have used aftermarket ICM units with no issues in the past but of course OEM is best. Try a buddys and see if the issue goes away.
Old 03-13-2024, 07:32 AM
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Default Re: No start when hot. Starts good cold, drives great.

Check ECU. Had a similar problem and ECU was fried.
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