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throttle not responding by taps
Started on: 08-09-2013 05:05 PM
Replies: 4 (102 views)
Last post by: James Bond 007 on 08-10-2013 07:32 PM
taps
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Report this Post08-09-2013 05:05 PM Click Here to See the Profile for tapsSend a Private Message to tapsEdit/Delete MessageReply w/QuoteDirect Link to This Post
After having some troubles getting it to idle, and messing around with timing, it is idling, but when you give it gas it wants to stall.
our timing light shows we are at 10 degrees before TDC and if you give it throttle it wants to die?
86 2.8L 4sp muncie
Any help would be great!
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taps
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Report this Post08-09-2013 05:25 PM Click Here to See the Profile for tapsSend a Private Message to tapsEdit/Delete MessageReply w/QuoteDirect Link to This Post
UPDATE: we time it to 10 degrees before TDC in diagnostic mode, but when we try to start it in WITHOUT the two pins connected the timing goes to about 20 degrees before TDC
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phonedawgz
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Report this Post08-09-2013 07:21 PM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yep - the ECM adds advance. Is it bucking the starter when you try to start it?

Check your fuel pressure. Harbor Freight sells fuel injected fuel pressure gauges. 42 psi right after prime. 42 minus intake vacuum after it starts. The quick down and dirty test is to push the test valve with a screwdriver and see how high the gas squirts up. It should easily nail the rear deck lid.

Remember that is gas squirting up when you push that. Wear eye protection and don't start yourself on fire.
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Bloozberry
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Report this Post08-09-2013 09:19 PM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
Your problem could be with the throttle position sensor (TPS). If you have a multimeter you can check for a smooth transition starting from between 0.2V to 1.25V at closed throttle and then rising to 4.5V as you cycle to wide open throttle. To do this, back probe the TPS blue wire with the red meter lead and ground the black meter lead. You'll want the engine to be stopped, and the key in the "run" position. If you get any other values or if it's not a smooth transition, then your TPS is faulty.
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James Bond 007
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Report this Post08-10-2013 07:32 PM Click Here to See the Profile for James Bond 007Send a Private Message to James Bond 007Edit/Delete MessageReply w/QuoteDirect Link to This Post
If that all fails,the EGR builds up a carbon ring on the intake...Allso the EGR tube has been known to rust through.

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