jon L Posted March 14, 2022 Share Posted March 14, 2022 Here I go again. Fixed the stalling at idle. Now it runs perfect and Idles right, with no stalls. But out driving, when you push down hard it starts to move, then bucks like the motor was going off and on. Anyone anywhere, Help. I thought I fixed it, but no. It;'s back with avengence. Link to comment Share on other sites More sharing options...
DAVES89 Posted March 14, 2022 Share Posted March 14, 2022 It's one of three thing; Mass Air Flow Sensor Crank Sensor [out of adjustment Ignition Module/Coil Pack I am not good at diagnosing but I am good at part "SWAPPING" which is why I have either known good parts or new parts in the parts bin... Link to comment Share on other sites More sharing options...
2seater Posted March 14, 2022 Share Posted March 14, 2022 Have you tried watching for knock retard under heavy load? Some of the pump gas is of questionable quality over the winter months. Link to comment Share on other sites More sharing options...
Padgett Posted March 14, 2022 Share Posted March 14, 2022 Most likely secondary ignition if no codes are set. Plugs, plug wires, coils. If so I'd recommend switching to a Delco ignition as used in the 91. Plug and play. Link to comment Share on other sites More sharing options...
jon L Posted March 15, 2022 Topic Author Share Posted March 15, 2022 Just replaces the crank sensor, and the coil pack seems Ok. I am going to disconnect the Maf, and drive it tomorrow. Link to comment Share on other sites More sharing options...
DAVES89 Posted March 15, 2022 Share Posted March 15, 2022 (edited) If you just replaced it you might want to check the crank sensor to see if it slid out of adjustment. Mine came loose in the bracket and moved [actually pretty freely] so it would start and run really good and then to the other extreme would barely start. Then when it slid to a point where it would be in the "middle" of the two extremes buck and kick on the road both city streets and highway. 2 seater and I swapped many parts [coil pack/ignition module, plugs, plug wires, MAF Sensor, Fuel Regulator, EGR valve] before we tracked this down. Edited March 15, 2022 by DAVES89 Link to comment Share on other sites More sharing options...
Padgett Posted March 15, 2022 Share Posted March 15, 2022 If the CPS was loose, I'd expect ED08 to be jumping around. Link to comment Share on other sites More sharing options...
jon L Posted March 15, 2022 Topic Author Share Posted March 15, 2022 Crank P sensor is the newer kind, no adjustment, just bolt in in. I disconnected the MAF and took it out, It didn't buck it just started to miss badly. Anyone know how to check coils? I think I will change the plugs, the wires are heat duty and are good. If you all remember I had a ICM go bad, and I changed one coil back a sways. Link to comment Share on other sites More sharing options...
jon L Posted March 17, 2022 Topic Author Share Posted March 17, 2022 Replaced the spark plugs (E3") they are junk. One was not even firing. It was clean and shiny. Another was broken inside. You could turn the connection on the end of it. Installed a set of Bosch plugs and everything seems normal. Thanks for all the help guys. 2 Link to comment Share on other sites More sharing options...
2seater Posted March 18, 2022 Share Posted March 18, 2022 Thanks for letting us know. I have a somewhat similar situation at times with my incompletely tuned turbo installation so I assumed it was my fault. I may have to rethink that because I may have some oddball plugs in mine as well, maybe a twin ground type? I guess that would still be my fault but it would be a deviation from what I usually use Link to comment Share on other sites More sharing options...
jon L Posted March 18, 2022 Topic Author Share Posted March 18, 2022 I was impressed with the write-up on the E-3 plugs, so I purchased a set and installed them. At first they seemed alright, but as time went on I started to hev trouble, Missing, Bucking, and lack of Power. RPMs limited to 4500. Then I didn't realize that it was the plugs. I went off the deep end figuring it was something else. I did find a few other problems, but none of them solved the problem until I changed the plugs. 1 Link to comment Share on other sites More sharing options...
ADRIAN Posted March 23, 2022 Share Posted March 23, 2022 Check the 02 sensor on the exhaust Link to comment Share on other sites More sharing options...
Padgett Posted March 23, 2022 Share Posted March 23, 2022 There used to be a Splitfire spark plug and NGK has some oddballs. I had a set of Fire Injectors which had multiple electrodes but for my cars I just use Delco Rapidfires or Iridiums. Gap .045 for Magnavox or .060 for Delco ignition. 1 Link to comment Share on other sites More sharing options...
jon L Posted March 24, 2022 Topic Author Share Posted March 24, 2022 (edited) 02 sensor new, so is the downpipe 02 sensor. Edited March 24, 2022 by jon L Link to comment Share on other sites More sharing options...
Ronnie Posted March 24, 2022 Share Posted March 24, 2022 I didn't realize the SC engines used two O2 sensors. Does that mean you have to use a different ECM and associated wiring? Link to comment Share on other sites More sharing options...
jon L Posted March 25, 2022 Topic Author Share Posted March 25, 2022 No Ronnie, The second one is just for a true reading on the dash that you can see all the time and it is also a heated 02 sensor. Link to comment Share on other sites More sharing options...
Ronnie Posted March 25, 2022 Share Posted March 25, 2022 Thanks. Good idea. I have a friend with a Cobra that he built himself from a kit. He installed something similar in the exhaust pipe that gives him a constant readout of the air/fuel mixture. 1 Link to comment Share on other sites More sharing options...
Padgett Posted March 26, 2022 Share Posted March 26, 2022 Please explain "downpipe". Downstream O2 sensors are not supposed to read much off zero. Upstream can read O2 value but Reatta never used a heated sensor. Link to comment Share on other sites More sharing options...
jon L Posted March 27, 2022 Topic Author Share Posted March 27, 2022 This is an aftermarket unit. It is stalled just below the header in the down pipe. Link to comment Share on other sites More sharing options...
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