Engine idle?

[syclone rider]

Ok i changed the fpr on my sy from stock to kb and set the fuel pressure at 42 with the vac line off now the truck is idling around 1200 what could have changed it?Its got new plugs,wires cap and rotor and all new vac lines minus the vac ball new fuel pump and fuel filter.Any help will be much appreciated.

 

[REVEREND HARMON]

Re: Engine idle?

Ok i changed the fpr on my sy from stock to kb and set the fuel pressure at 42 with the vac line off now the truck is idling around 1200 what could have changed it?Its got new plugs,wires cap and rotor and all new vac lines minus the vac ball new fuel pump and fuel filter.Any help will be much appreciated.

Sounds like a vaccum leak....make sure to recheck them and make sure the check-valves are facing the right way.

 

[syclone rider]

Re: Engine idle?

Sounds like a vaccum leak....make sure to recheck them and make sure the check-valves are facing the right way.

Man ive checked all the lines i thought the samething but they are all good and the check valves are right.

 

[WyoSyclone]

Re: Engine idle?

If it's idling higher it's leaner..... I'd bump the fuel pressure up to 48 and see what happens.

 

[turboj91]

Re: Engine idle?

Did you check the FP before you changed FPR's?

 

[Don W.]

Re: Engine idle?

Asking the obvious from the wording of your question: While the vac line was off to set fuel pressure did you plug it? OK now a couple of real questions; Is the IAC elec. plug fully seated? (It's close by could have been bumped.) If you had the throttel body off did you reattacfh the small vac line on the bottom? (Easy to forget, I've done it.) Did you somehow not get the PVC line back on corectly or if original did it crack? What happens when you bump the throttle? Did the vac line on the back of the manifold pull loose? Any codes?

Just thinkin' out loud...

 

[syclone rider]

Re: Engine idle?

If it's idling higher it's leaner..... I'd bump the fuel pressure up to 48 and see what happens.

Before i adjusted it it was at 48 and it still was idling that high then adjusted to 42 and it wasnt idled up that high before i put the kb one on.

 

[WyoSyclone]

Re: Engine idle?

Before i adjusted it it was at 48 and it still was idling that high then adjusted to 42 and it wasnt idled up that high before i put the kb one on.

Did you disconnect the battery or have the chip out of the ECM? If so, it will idle at 1800 for about 2 or 3 minutes before it settles down into it's normal cold high idle.

 

[syclone rider]

Re: Engine idle?

Asking the obvious from the wording of your question: While the vac line was off to set fuel pressure did you plug it? OK now a couple of real questions; Is the IAC elec. plug fully seated? (It's close by could have been bumped.) If you had the throttel body off did you reattacfh the small vac line on the bottom? (Easy to forget, I've done it.) Did you somehow not get the PVC line back on corectly or if original did it crack? What happens when you bump the throttle? Did the vac line on the back of the manifold pull loose? Any codes?

Just thinkin' out loud...

Ok im going to try to answer these in order 1no didnt plug it 2 yes 3 did not take tb off 4 its not origiinal just changed all the vac lines 5 sometimes it will idle back down and cut off 6 no and no codes no light at all.

 

[syclone rider]

Re: Engine idle?

Did you disconnect the battery or have the chip out of the ECM? If so, it will idle at 1800 for about 2 or 3 minutes before it settles down into it's normal cold high idle.

Yes i have done both.

 

[syclone rider]

Re: Engine idle?

And i have seen it idle around 1800 at first.

 

[gkrcr882]

Re: Engine idle?

Did you try cleaning out the IAC and the throttle body? You mentioned that after you gave it some gas it would cut out, could you elaborate? You may have to do the bike tube trick to double-check the intake and vacuum system.

 

[syclone rider]

Re: Engine idle?

Did you try cleaning out the IAC and the throttle body? You mentioned that after you gave it some gas it would cut out, could you elaborate? You may have to do the bike tube trick to double-check the intake and vacuum system.

I guess ill try the bike tube trick and see.

 

[syclone rider]

Re: Engine idle?

Does anybody know what the stock fuel pressure is?Cause now it flashed the code for lean exhaust gas and it was fine before i put the kb regulator on idled fine and ran fine no codes.Like i said before the fuel pressure was around 47 and it was doing the samething.Now my wideband want read it just flashs 7.4 while the truck is running.