hesitation then takes off like a bat out of hell.
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Northstar Engines and System Technical Discussion Discussion, hesitation then takes off like a bat out of hell. in Cadillac Engine Technical Discussion; Getting a lag or 1-2 sec hesitation out of my 2000 eldo etc as well as my 00 seville. On ...
  1. #1
    Eldobroken's Avatar
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    hesitation then takes off like a bat out of hell.

    Getting a lag or 1-2 sec hesitation out of my 2000 eldo etc as well as my 00 seville. On the seville I did a few wot's and it went away. On the eldo I just put a new fuel pump oem part and a full tank of super. Also filter is new also. When i mash the throttle I get a break up lag then spins the wheels and runs great. Any Ideas? Also I did not get gas from the same stations so i do not think that is a problem. Any ideas Guys i have 90K miles mabye time for a tune up. BTW air filter and oil are new also. Engine Idles so good you do not even feel it and runs great but the hesitation is bugging me. Thanks,

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    Cad tech's Avatar
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    Re: hesitation then takes off like a bat out of hell.

    Try a throttle body clean, and yes spark plugs would be a great idea...

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    Re: hesitation then takes off like a bat out of hell.

    Quote Originally Posted by Cad tech View Post
    Try a throttle body clean, and yes spark plugs would be a great idea...
    Thanks man funny just picked up a can with a new battery i needed. Supposedly the HEI wires are expensive ?

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    caddydaddy's Avatar
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    Re: hesitation then takes off like a bat out of hell.

    Have you checked the codes? On my 2000 STS I had the same problem, and it was a faulty MAP sensor. Could be the same problem on your cars.

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    Re: hesitation then takes off like a bat out of hell.

    The old school experienced guys (like me) would look for fuel pressure first.

    I'm not sure about a caddy.. but is there a fuel pump relay that goes into action when heavy throttle is commanded? (typical problem on lightnings)

    Rich

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    Re: hesitation then takes off like a bat out of hell.

    There is a relay, but I think it is only in use during cranking.

  8. #7
    Eldobroken's Avatar
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    Re: hesitation then takes off like a bat out of hell.

    Quote Originally Posted by wydopnthrtl View Post
    The old school experienced guys (like me) would look for fuel pressure first.

    I'm not sure about a caddy.. but is there a fuel pump relay that goes into action when heavy throttle is commanded? (typical problem on lightnings)

    Rich
    Fuel pump and filter are new where would this relay be located.

  9. #8
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    Re: hesitation then takes off like a bat out of hell.

    Quote Originally Posted by caddydaddy View Post
    Have you checked the codes? On my 2000 STS I had the same problem, and it was a faulty MAP sensor. Could be the same problem on your cars.
    I will check codes today. The tranny shop just put some new CV joints in due to one breaking when these idiots were driving the car, Yeah I was pissed. But if they added tranny fluid it is possible they messed up the wires to the mass air flow sensor although they look fine.

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