Recent content by lamarZ06

thanks HH............ I was able to trace problem to wire harness at the tank/12$S..Thank you for your interest and time...lamar

...Thanks for your help...ground to fuel pump harness was at fault... ...your help through this mess helped me zero in on malfunction...ended up cost me $12.95 / harness; after 30 years it was time for a new one............thank you......lamar

Antz81 Antz...when pressure drops to 20/15 the wires at the tank were moving in concert with pulsator.What the hell is that for/ Is this what I had confused 'limp home' with. replace or re-route? And what action engages pulsator? You have been a tremendous help. Maybe getting closer to the...

..Hey ANTZ... ...Re-wired ..I felt as you do about the FPR...I don't really know how the FPR works half open, full open..It regulates pressure ...just don't know how...I have seen the diaphragm..Thanks

....antz.... ...I clamped the return line and started motor.. pressure went to 40 psi. ..I ran it at idle aprox. 1 min..then pressure dropped...before.. motor would show 40 run few seconds pressure drop to 20/15 to stall. Does this point to a cause? thanks..

...antz.... ....Just lettin' off a little steam ..Hell,I can't afford 'Webbers'...haven't changed the harness just yet...But like you said FPR....cars outside under a tarp w/anifreeze...it's turning cold here... won't be the first winter it has spent under snow. If that's it..the FPR may have...

...thanx... ...I do find the fpr suspect, I have pulled the vac no fuel found...I'm almost convinced that's it but not enough to pull the plenum...I checked the voltage at the tank... the positive feed to the harness looked poor ....reconnected,pump running i was able to shut down the motor...

...fpr... ...QUESTION...if the fuel pump regulator was damaged; could it produce 40 psi. at the schrader then drop to flutter at 20/15 psi.? it will idle at 20/15 ruffly then die ...thanks ANTZ j.

...#$%^&... '''don't know how you could possibly interpret my question as an insult.. surely was not my intention'''

...thanks... ..I suspect the FPR..filter new..I'm not ready to pull the plenum...not ready to throw money at it until I'm able to isolate problem..pump new...Fuel pressure held 40 psi. for 50 miles then went to limp... it never recovered,,,fuel tank drained before new pump some water...I need...

...thanks...I've been going over these circuits for a couple of months...daily .. j

...Thanks Antz... ...Is your '81 an L98 tpi w/ countless sensors feeding an ECM.? and.. I don't know the AIM.? Thanks.. j. this c4 may never be more than a hot rod but so far I can't get past the 'limp home'.. lamar

Fsm... ...also Helms list shop man. @ $82///////////owners $32... j.

FSM check..... ..also to the best of my knowledge the oil pressure switch is what the ECM uses to regulate or trip the 'limp home'.... j.

...'limp mode'... ...Hey roy. Thanks for reply..Correction/190,000 mi...'Haynes Repair' and what information I get on internet...What I'm having trouble with is finding the cause of the 'limp home'...Car starts idles fine ..FP to start 40 psi. after 30 seconds FP drops to 20/15 psi...hit the...