1g-gte misfiring on first few seconds of startup - common?

**auto351** · 13-10-2009, 09:56 PM

Sleepy1G, if you were to turn the key and wait 5 seconds before cranking do you still get the problem ?

Just thinking out a loud
“if you are losing pressure over night, then the fuel line pressure would return very quickly once the fuel pump is started & well before the engine sparks up,
If there is no fuel pressure then the engine will not start so this indicated there must be fuel pressure”

**sleepy1g** · 13-10-2009, 10:11 PM

pressure is there within a second or 2,

i'm wondering if there maybe a glitch in the map for the cold start. wonder if it more on a particular variant of the 1g

**Z2TT** · 06-11-2009, 08:23 PM

if there would be a glitch on the cold starts for the map, wouldn't all 1g-gte's of a certain generation do it then?

**auto351** · 08-11-2009, 05:04 PM

I too don’t think it’s a glitch in the maps (the ECU only uses the maps for fuel correction as I understand it) and this would be evident from the factory, it may however be older capacitors which are showing there age and leaking.

but from what I have read we have still not ruled out the fact that fuel is leaking out of the system (via the injectors?) this causing air/vapor lock and this would take time to flush out, even with fuel pressure when the air/viper hits the injector it would cause a loss of fuel for a short time.

I think even if we loss pressure over night as long as there is fuel (only) in the lines once the key turned fuel pressure & supply is restored instantly.

**Z2TT** · 08-11-2009, 05:37 PM

Yeah that's what I've been told, pressure will drop but as long as there is fuel remaining in the lines it shouldn't be a problem. If a fuel pump check valve was bad i'd assume fuel would leak back into the tank and cause a bad start.

Other than that I'd agree with the dirty injectors causing fuel to leak into the inlet tract.

**auto351** · 08-11-2009, 06:03 PM

are you planing on getting the injectors checked & serviced ?

**Z2TT** · 08-11-2009, 08:04 PM

Yes I am....

**Z2TT** · 13-11-2009, 06:21 PM

Hi,

About a week ago I changed the Spark plugs from NGK BCPR6ES to Denso PQ20R's that I had from my old soarer, since then it has been starting better, but only sometimes, other times the same problem.

Wondering if a fuel pressure reg could cause this.
Looks like I'll be replacing the fuel pressure reg next.

Thanks.

**Z2TT** · 14-02-2010, 10:52 PM

I have since changed the fuel filter, not sure if that has anything to do with it but it didn't help.

Been looking for a fuel pressure reg, as I sold my old one with the rail. Does anybody have one?

Other than that the only other thing i could do is get the injectors cleaned.