Hi all,

just adding my voice to the ocean of slow hot start MCS owners. Bought my 05 with 140k on it and I’m experiencing the same exact issue. 3-4 second sputtering start after sitting for a short while when hot. I’ve been thinking definitely a fuel issue, since this reminds me of what my Chevy s-10 ZR2 did. They are notorious for slowly dying fuel pumps. I see someone in this thread has a new-ish pump that is still doing this though. Lines issue? Is that what we’re silently agreeing on?

 

I thought about that as well. I just replaced my cam position sensor last week as another "shot in the dark". Didn't make any chance. Eventually I will do the crank position sensor, and if that doesn't fix it my last resort is the fuel pump.

Chris

 

i have same issue do you resolve problem?

 

before replace fuel pump do test for fuel pressure them will figure out the issue from FPR or fuel pump or injector or filter or weak pump

 

Reviving an old thread as I am experiencing the same. It started after changing camshaft to RMW Dominator and Bosch 550cc injectors.

anybody get any luck resolving this? Any other thoughts?

 

It may not seem related, but I would clean the battery & engine ground straps to bright, tight connections.
It only takes a few minutes, then see if there's any effect.
I had a Fiat once that would start easily, cold, but cranked forever, hot. It was missing an engine ground.

 

Thanks for the response, but I even replaced the battery so I doubt it is that.

 

Didn't read the entire stream but can we assume you re-tuned after upsizing the injectors?

 

new bat. is one thing, clean engine ground, another

 

Thanks for pointing that out. Yes, I did that too when I had it disconnected for the Camshaft install. I cleaned it, but didn't use sand paper or anything, just simple green and rag. It looked clean and bright to me, no rust or any signs of corrosion.

 

I am having same problem, lol. It used to start good cold then not when hot. Now it's always a long start it seems between 3-10 seconds. I'm not willing to just throw parts at it I wish there was a better way to troubleshoot sensors with advanced diagnostics. It runs flawlessly all day long for 500 miles commuting home on weekends. Even ******* it lugging it. But just doesn't like to start. Sputters to life slowly as others describe. It seemed traditionally to always love super cold days the best and start almost instantly, lol. So I thought it was a coolant sensor or something telling the car it was too cold. I could try fuel filter that's easy enough but since it runs great once going I can't imagine it's that.

When we turn key does the fuel pump run for a short period of time? I want to try this a few times, but it doesn't seem to make much difference if I pause then start or cycle key a couple of times with pauses in between in the "on" state to let fuel lines charge up