Startup Gremlin after 1-2 hours parked.. Any thoughts?

[Ryan S.]

Search 'hot start' and you will see bunch of postings describing your symptoms.
Common solution is to replace an accumulator. It's a PIA job so you may want your mechanic to do this.

fuel pressure gauge can also diagnose source of your problem.

[sdg3205]

There are a number of places where failure would cause hot start issues:

1. Accumulator
2. Fuel pump check valve
3. primary pressure regulator o-rings
4 leaky injectors
5 I forget the fifth

I have had hot start issues with 1, 2 and 3. You need to measure rest pressure. Once you confirm you are loosing rest pressure you can begin to test each component. A bad check valve for example drops rest pressure very quickly. The PPR and accumulator tend to trickle down more slowly IIRC.

Edit - 5 is a leaky cold start valve IIRC

[norcimo]

Thanks

[norcimo]

There are a number of places where failure would cause hot start issues:

1. Accumulator
2. Fuel pump check valve
3. primary pressure regulator o-rings
4 leaky injectors
5 I forget the fifth

I have had hot start issues with 1, 2 and 3. You need to measure rest pressure. Once you confirm you are loosing rest pressure you can begin to test each component. A bad check valve for example drops rest pressure very quickly. The PPR and accumulator tend to trickle down more slowly IIRC.

Edit - 5 is a leaky cold start valve IIRC

Question,

When setting the mixture, what should be the RPMS? during the setup?

Thanks

[Bitsyncmaster]

Question,

When setting the mixture, what should be the RPMS? during the setup?

Thanks

I think the book says set 950 RPM but I've found just do it with 775 and the mixture does not change with higher RPM.

[norcimo]

Problem Fixed.

one clogged injector.. I did the mason jar test.. Number 3 barely vaporizing. All the others were great. This was a new injector

so cleaned it with brake cleaner.., it worked... tested,, pattern came back and is all good.

Also... one bad O2 sensor... got one from Amazon for 8 bucks. man was my dwell off! WOW!

ok.. fixed that , Nice idle at 775-800 Rpm.. no hunting.. and dwell meter oscillates between 38-44, mostly hitting 40 on average. and rich smell is gone.


car starts on the spot after two hours ...great!

OPINIONS please?

[Jonathan]

Hi,

There is one thing I can seem to find the fix.. Is this startup issue, where it just won't start, and when it does it hesitates., you almost kill the battery for
constantly cranking.. does it occasionally...depends on how long it sat.

IT does this after I go for a 20-30 minute ride.. I park the car...spent a 1 hour or 2..."eating"...whatever, when I come back, has problem starting.
Don't get me wrong, it will start eventually, it just fight me... like it was vapor lock or something...

Can not seem to find the problem, because its very specific... This is what I know:

1. Car over night Garage, in the morning , starts right up.. NP.
2. No idle issues.3. Plenty of Power.
4. Not running rich nor too lean.5. Runs while cold or warm engine.
6. No idle hunting.7. voltage is great, system changing.


I read that a relay upgrade can fix this issue? Any help will be great.. thanks

Problem Fixed.

one clogged injector.. I did the mason jar test.. Number 3 barely vaporizing. All the others were great. This was a new injector

so cleaned it with brake cleaner.., it worked... tested,, pattern came back and is all good.

Also... one bad O2 sensor... got one from Amazon for 8 bucks. man was my dwell off! WOW!

ok.. fixed that , Nice idle at 775-800 Rpm.. no hunting.. and dwell meter oscillates between 38-44, mostly hitting 40 on average. and rich smell is gone.

car starts on the spot after two hours ...great!

OPINIONS please?

Your initial problem description and stated facts don't match your description of the solution and things you corrected.

Glad you fixed it, it just makes it difficult for someone to offer help or suggestions when the details aren't consistent.

[sdg3205]

Your initial problem description and stated facts don't match your description of the solution and things you corrected.

Glad you fixed it, it just makes it difficult for someone to offer help or suggestions when the details aren't consistent.

+1

Glad you're back on the road, but one semi- clogged injector would lead to a terrible running condition and have harder starts across the board with no regard to hot or cold conditions. You may still have a problem, but have come across another issue in the process.

[A Van]

Few guys over here have seen warm start issues lately, with hot and cold starts fine.
The culprits have always been injectors leaking at rest and not holding pressure.
Quick test pop the injectors out after 30 mins after a run, if one or more comes wet , there is the problem.

[norcimo]

Kudos to the Upgrade RPM relay.

My engine starts on the first crank. No matter how long its sits between trips..

Simply amazing.

Thanks.