95s-10 hard starting when warm

[dad2kylie]

Originally Posted by rlith

those are the codes... Sounds like an injector problem... You actually have the 1st revision ODBII. But by all the codes set, it looks like you're dumping fuel. Pull the upper plenum and check for washing.

If I pull the upper plenum and find washing would i replace the injectors to correct the problem?

[rlith]

If the passenger side is washed, replace the CPI, if the driver's side is washed, replace the nut kit. If you do replace the CPI, replace the nut kit as a matter of course as they weaken with age... If you have over a 100k on the existing nut kit, replace them while it's open so you don't have to worry about it later.

[BlazerLT]

Originally Posted by movin2stereo

Blazer,any idea why mine would do it?I don't have the nice Vortec cover though.

You are having hard starting?

[dad2kylie]

Originally Posted by rlith

If the passenger side is washed, replace the CPI, if the driver's side is washed, replace the nut kit. If you do replace the CPI, replace the nut kit as a matter of course as they weaken with age... If you have over a 100k on the existing nut kit, replace them while it's open so you don't have to worry about it later.

Will that work if i take the vortec cover and look through the sensor hole to see if the passenger side is washed?

[BlazerLT]

Yes, that will work.

You will smell gas too.

[movin2stereo]

Originally Posted by BlazerLT

You are having hard starting?

Yea as I said when it's cold it fires right.When it's warm sometimes it fires right up,but must of the time it's turns over for 4-6 seconds before it fires.

[BlazerLT]

So when you say "warm", you are talkig about the engine right?

[dad2kylie]

Originally Posted by rlith

If the passenger side is washed, replace the CPI, if the driver's side is washed, replace the nut kit. If you do replace the CPI, replace the nut kit as a matter of course as they weaken with age... If you have over a 100k on the existing nut kit, replace them while it's open so you don't have to worry about it later.

Do you think the fuel pressure regulator could be causing this problem?

[BlazerLT]

Yes, but you just don't replace it, you replace the whole injector.

[movin2stereo]

Originally Posted by BlazerLT

So when you say "warm", you are talkig about the engine right?

Yes.

[dad2kylie]

i replaced the regulator and it seems to have resolved the problem

[rlith]

Originally Posted by dad2kylie

i replaced the regulator and it seems to have resolved the problem

So it was the CPI unit afterall... Glad you found a fix... Hope you replace d the nut kit while you had the plenum open, it will save you from future problems later on.

[dad2kylie]

it seems to have solved the problem thanks for the help

[movin2stereo]

Originally Posted by BlazerLT

So when you say "warm", you are talkig about the engine right?

Yes.Is this CPI my problem?Do I even have one?

[rlith]

Originally Posted by movin2stereo

Yes.Is this CPI my problem?Do I even have one?

No, you have CSFI, similar to CPI but sequentially fired (CPI was discontinued in 95)...If you're running rich one of your injector hoses may be bad. (also causes misfires)