timing chain.

[rockyracoon]

If my chain jumped a tooth or is stretched would my compression be affected.im thinking that the reason that my car is kinda sluggish is that the cam timing is off,however the results of a compression test showed all cylinders around 150 PSI.the car just has no guts.It has been fully tuned up,timing st at 14*spout out,passed cylinder balance test,cleaned mass air,set TPS,no codes in memory or for engine running.fuel PSI is 33PSI regulator vac line on and around 43 with line off,however pressure dies immed when engine is shut off.

 

[vikingpower]

The factory timing set is pretty stout. It is highly unlikely that's your problem. The chain is made of steel, not rubber. It's not possible for it to stretch enough to 'jump a tooth'. Dont take any more advise from the person that told you that, they dont know what they're talking about!

 

[bill302]

does the motor ping during acceleration and you say timing st at 14*spout out.this is a little unclear you did reinstall the spout after you set the timing.and was fuel filter replaced during tune up.

 

[vristang]

What happens to the pressure when the engine is shut off?

 

[JRPony]

The factory timing set is pretty stout. It is highly unlikely that's your problem. The chain is made of steel, not rubber. It's not possible for it to stretch enough to 'jump a tooth'. Dont take any more advise from the person that told you that, they dont know what they're talking about!

Actually, it is possible for a chain to stretch to the point where it will skip a tooth.
Also, a better way to check to fuel pressure is to hook up the gauge, turn the key (engine off) and watch the pressure. When the pump turns on it should build to approx 40 psi and when the pump shuts off, the pressure should maintain. Then start the car and watch your fuel pressure. If possible, tape the gauge to your windshield and drive around and watch the fuel pressure. Also after shutting the key off, the fuel pressure should maintain. If it doesn't then either the pressure regulator or the pump itself could be at fault.

 

[HISSIN50]

I agree with JR but would add that some aftermarket AFPR's bleed pressure off almost immediately once the car is shut off. Just something to remember.

 

[rockyracoon]

timing set with spout out then reinstalled.no pinging @ 14*.new fuel filter.I was told byanother member that if the pressure does not maintain then the bypass in the f/p is not working correctly and that makes sense cause my car takes up to 7 revolutions to start.I have personally seen timing chains stretch to the point of making the car run sluggish or even jump time.

 

[JRPony]

.I was told byanother member that if the pressure does not maintain then the bypass in the f/p is not working correctly and that makes sense cause my car takes up to 7 revolutions to start.

There is a check valve in the fuel pump that can fail that will also allow pressure to drop after the pump has shut off.