Won't Start When Hot

[bigfoot_233]

Hi Guys,
I have an '89 2 liter that wont start hot unless the accelerator is on the floor and sometimes that does not help either. This has been a sort of steady problem, only before it was easier to get going. Once running it will idle fine but when the accelerator gets to a certain point the motor bogs pretty bad but will pick up again if pushed further. It starts with no problems when cold but will still bog when cold. Another thing i should mention is that it does not bog when in neutral or park. Any tips are greatly appreciated.

[Jimnist]

Well, if you need to open the throttle, i would guess that your engine is running rich for some reason.

Don't know how to solve.....XD

[bigfoot_233]

Could it possibly be the Throttle position sensor? I've checked the Mass air flow sensor and it seems to be working fine. I get great spark to all four holes with good fuel pressure.

[Jimnist]

Possibly. The TPS, IAC(idle air control), TB anything around that area.

[new echo owner]

Check the engine coolant temp sensor to make sure it is working properly.

N.E.O.

[bigfoot_233]

Thanks guys i'll try those.

[Mike Gerber]

I agree with NEO about checking the engine coolant temperature sensor. It may be out of range and constantly tell the ECU that the engine is cold. This would create an excessively rich mixture all the time. That would be OK for a cold engine but too rich for a warm engine. If the collant temperature sensor checks out OK, I would next check the cold start time switch. It too could be out of range and always activating. This too would create an excessively rich mixture. They usually fail the other way, not activating when cold, but you never know.

Mike