No start when hot. Starts good cold, drives great.
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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.
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.
#2
#3
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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
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
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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?
any other ideas?
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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)
#11
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?
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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.
#13
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
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Re: No start when hot. Starts good cold, drives great.
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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.
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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.
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?
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?
#19
Re: 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.
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.
#20
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
#21
Honda-Tech Member
Re: No start when hot. Starts good cold, drives great.
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.
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